Listview function only showing partial list

Hello, I hope someone reading this can assist. I'm utilizing the listview function for my app and the problem I'm experiencing is that on some of the lists I compiled, only a partial list of items I entered in listview is visible when I test the app. I thought this had to do with the length of the lists but surprisingly, I have lists with more items showing completely while lists with fewer items only showing partially.

What can I do to ensure that all items entered in listview are visible to the app user?

We do not know, you do not show us what you are doing.

Please show your relevant blocks, example lists that do not work, screen shots.

It may also be worth creating a test project to try out the non working lists there....

Give the listview the space it needs to show all items