Most of the time, after a query, I need to do the following sequence to see the full screen data grid: . Usually, if I forget and do immediately, the screen seems to get stuck. Then I have to use a few times to get it freed up and ready to accept for the full screen grid.
FWIW, I work with TOAD displayed on my second monitor. The monitor is rotated to portrait orientation and I have the TOAD window opened at about 1050 x 1890. I have the editor panel pulled up a bit so I can normally see a little of the data grid panel below the editor window