In the standard view, I drag the Tag window down to its smallest size, then typically work in the window above (Database group structure), expanding into sub folders etc.
Under certain circumstances (which I have not yet figured out), the Tag window suddenly increases to maximum vertical size, and the Database group window to its smallest size. I have done nothing to change it.
Then I manually drag it back down again. It seems entirely random. Is there a setting which I need to change, or have misunderstood?