It seems like maybe you have some settings that have gone awry.
Let’s try this:
Main Menu -> Utilities -> Copy User Settings.
Check “Reset to a clean set of user files”
OK.
That will rename your settings folder and then Toad will restart, looking freshly installed. If you want to get some settings back (like connections), I can help you with that afterwards.
assuming version 13.1, the folder will get renamed like this:
C:\Users(your user name)\AppData\Roaming\Quest Software\Toad for Oracle\13.1 to
C:\Users(your user name)\AppData\Roaming\Quest Software\Toad for Oracle\13.1_bak