RESOLUTION #1:
Grab the right side edge of the window and move it left or right to adjust the width of the window. Sometimes it can be very touchy and hard to grab the edge. Slowly move the cursor from left to right over the edge and at some point it should change the look of the cursor. This is when the edge can be grabbed.
RESOLUTION #2:
1) Make sure Toad is closed.
2) Open the Toad.ini file, which can be found in the C:\Users\\AppData\Roaming\Dell\Toad for Oracle\\User Files, where x.x is the version of Toad being used.
3) Find the following entries and change their values to zero, as shown.
TSESQLRecallFrame_coords=0
TSQLRecallFrame_coords=0
4) Save changes and close file.
5) Launch Toad and test issue.