Click the “Load tables like” item of the 3rd toolbar button.
When the dialog appears, ‘like’ is disabled (but checked). If you
want everything, just leave a % in the edit box, otherwise enter something else
(A% to get everything that starts with A, for example)
As for something disappearing when you check it – do you have a filter on
the checkbox column of the grid? Sounds like you do. I’m not sure what
else it could be. Maybe I’m misunderstanding what’s happening.