GIMP doesn't show Tools window
I have this problem as well. Sometimes the tools window is inside another screen.
Shortcut:
Ctrl + B
Try the following.
- under the Windows tab click Single Window Mode
- if the tools window isn't inside the main window, use the Windows tab again and click Dockable dialogs → Tool options.
If the tools and layer box didn't go inside your main gimp window try toggling the Single Window Mode. This helps sometimes.
From the GIMP menu select Windows -> Toolbox
Shortcut Ctrl + B
Make sure you don't have the Windows
->Hide docks
option enabled.