Below is a picture with the window not in maximize mode:
But when I maximize it it does this:
There is a black bar. This only happened just recently, and yes i have tried restarting my chromebook and mit app inventor
There is a black bar. This only happened just recently, and yes i have tried restarting my chromebook and mit app inventor
Does this only happen when you have the Companion app open? In a window/minimised ?
Does this happens on other web sites?
A black bar in the Chrome browser on a Chromebook [can be fixed by toggling full-screen mode with the F11 key](Google Search text**)
It's only on the companion app
That's on a chrome browser, not mit app inventor companion
Yes, my project is a web browser, and it happens even before it loads in (like the companion home screen)
It's only on companion, I tried with Google Play (another Android app), and it doesn't do it
Ran some tests on my Chromebook with companion app running, not seeing any issues, no black bar, working just as expected.
Yeah, same with my friend, he says it's not happening to him
Fixed using đł [FREE] Hidebars - an extension to display app full screen to hide system UI. Why does it do it? I have no idea
Another update: Using the set nav bar color changes the color of the "bar" so i think Chrome OS is trying to emulate a nav bar but when i do hide system ui i can't do maximize only fullscreen
Have you ever tried other Chromebooks? My schoolâs Chromebook has no black bar in project editor. Unfortunately, I can't download the companion app so I can't test it.
I would recommend you checking Chromebookâs Settings again because it also happens to your Google. Extension making the bar transparent also suggests that you might be able to turn it off in Settings.
ChatGPT
It looks like youâre seeing a known issue posted on the MIT App Inventor community forum where users report a black bar appearing when using the maximize mode on a Chromebook while running the Companion app. (MIT App Inventor Community)
Hereâs a breakdown of what they're experiencing, what is known so far, and some possible workâarounds:
Whatâs happening
- The user (âbrandonhâ) sees no black bar when the window is not maximized. (MIT App Inventor Community)
- When they maximize the window (on a Chromebook) the black bar appears. (MIT App Inventor Community)
- It only happens in the Companion app environment (i.e., when using the MIT App Inventor Companion app) â they tested other apps (like something using Google Play) and didnât see the bar. (MIT App Inventor Community)
- One workaround reported: the user installed an extension called âHidebarsâ to hide system UI. This seemed to remove the black bar, though it changed the way maximize vs fullscreen behaved. (MIT App Inventor Community)
- Another observation: when they changed the navâbar color in their app (via âset nav bar colorâ), the barâs color changed â which indicates that the black bar may be part of Chrome OS (or the Companionâs wrapper) drawing a navigation/system bar zone. (MIT App Inventor Community)
Possible causes
- It may be a Chrome OS or Chromebook windowâmanagement quirk: maximizing vs fullscreen differ, and the system may reserve a strip (system UI or nav bar) that doesnât get hidden when the app is simply âmaximizedâ.
- The Companion app may be rendering in a mode (e.g., webview + Android container) where OS bars (navigation, status) are overlaid, and maximizing doesnât hide them properly.
- The navâbar color change behavior suggests the Companion app has some control over the bar area, but maybe thereâs a mismatch between what the app requests and what Chrome OS enforces.
- Because the issue doesnât reproduce for all users, it might be device-specific (model of Chromebook), OS version, or interplay of extensions/settings.
Workâarounds & tips
- Try using fullscreen (F11 / Chrome OS equivalent) instead of maximize. One user suggested toggling fullâscreen mode fixed the black bar (though possibly on a regular browser rather than the companion). (MIT App Inventor Community)
- Use the âHidebarsâ extension (or similar) to force hide system/navigation barsâthis worked for the user albeit with some tradeâoffs (couldnât maximize, only fullscreen). (MIT App Inventor Community)
- Check if your Chromebook has any newer OS or Chrome OS updates â the issue may be fixed in a later version.
- Test on another Chromebook or user profile to isolate whether itâs device/setting specific (since another user âfriendâ said it wasnât happening to him). (MIT App Inventor Community)
- As a fallback, avoid maximizing and instead manually adjust window size to nearâfull screen or use true fullscreen mode.
If you like, I can check for official bugâreports for this issue (with MIT App Inventor & Chrome OS) and see if thereâs a fix planned or known version where itâs resolved. Would you like me to do that?
I checked and no, I didnât find an official documented bugâfix or release note from MIT App Inventor that specifically addresses the âblack bar when in maximize mode on Chromebookâ issue. Hereâs a summary of what I found, and what you might do next:
What I located
- The issue is posted on the App Inventor community forum: âBlack bar when in maximize mode, chromebookâ. The thread describes the exact behaviour you mentioned: a black bar when the window is maximised on a Chromebook while using the Companion app. (MIT App Inventor Community)
- The forum thread includes responses from other users trying to replicate the issue, and one moderator asking followâup questions (âDoes this only happen when you have the Companion app open?â). (MIT App Inventor Community)
- The official âApp Inventor on Chromebooksâ support page notes general setup instructions and limitations, but does not mention this specific maximizeâmode black bar issue. (MIT App Inventor)
- The generic troubleshooting and FAQs for App Inventor likewise do not list this exact symptom as a known bug. (MIT App Inventor)
What we can infer
- Because the issue is reported, itâs likely a bug (either in the Companion app, in Chrome OSâs Androidâapp window handling, or in the way App Inventor uses Android apps on Chromebooks).
- The fact that it only occurs in maximize mode (not fullscreen or normal window) suggests it might be tied to how the window frame or Android app container is handled on Chromebooks when âmaximisedâ but not truly fullscreen.
- Because it isnât listed as an official bugfix, it may be unresolved, or possibly low priority or waiting for reproduction across more devices.
- The App Inventor team does appear to monitor the community forum, so your report has visibility.
What you can do / suggest
- In the forum thread you found, you could reply with details of your Chromebook model, Chrome OS version, Companion app version, and reproduce steps â this will help the MIT team or community members replicate and diagnose.
- Check for Chrome OS updates and Companion app updates on the Play Store. If thereâs a newer version of the Companion or Chrome OS that fixes window/hardware compatibility, updating might resolve the symptom.
- As a workaround: Use fullscreen mode instead of maximise; or manually resize the window slightly smaller than full screen to avoid the black bar.
- If youâre part of a managed Chromebook environment (school or institution), check whether windowing behavior or Android app container settings have been modifiedâsometimes IT policies or Chrome flags alter how Android apps are displayed.
- Consider filing a bug report (if you havenât already) via the forum or the âBugs & Other Issuesâ category in the App Inventor forum, referencing the thread number and your environment details. The more reproducible data they have, the more likely a fix will be prioritized.
If you like, I can scan the open issues tracker (if available) for App Inventor and check Chrome OS issue trackers for related Android app windowing bugs on Chromebooks â to see whether this might actually be a Chrome OS bug rather than App Inventorâs. Would you like me to do that?
My project is a web browser, sorry for the misunderstanding