There was a bug in Classic Apps that if you clicked the red ‘x’ to the right of the search field to clear the search box, it would clear the search box, but the search would still be in effect. You would still see only the items selected by your search term.
Glide recently fixed that, and at the same time modified the search so that if you select a searched item, when you return from the detail screen the search will be cleared and you will see all items again.
That is the behavior I am seeing lately. In fact, the behavior change is so noticeable that one user complained about it recently in this forum. I don’t imagine Glide will be modifying this behavior again; their focus is now on Apps.