Viewer in Blocks not visible for Screen

I'm running across something I have never seen before and need some help. We have about 600 kids in our after school programs using appinventor and I'm reviewing their apps.
I've got one where the Viewer in the Blocks screen has disappeared only for the Screen, ie. Screen1 click on it, no blocks. The other components all have the Viewer visible with all of the blocks.
Could the kids have somehow deactivated it??
a no viewer
a viewer with blocks

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(Canned Reply: ABG- Export & Upload .aia)
Export your .aia file and upload it here.

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hi, im also having the same issue, where my screen blocks are not showing up
Basic_Cal (1).aia (2.3 MB)

Feed_Your_Pet.aia (248.6 KB)

Check in Project Properties if the Blocks Toolkit is set to expert

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Go to project properties and choose Expert for block toolkit

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fixed, thanks!

Thank you so much it's fixed!!!!!!!!!!

I don't have expert option instead it's default option

Yes, because it has been renamed since then
Taifun