Open up the openbox config file, it should be located in /home/username/.config/openbox/ but if it’s not you might have to do a little digging.
nano /~.config/openbox/rc.xml
Find the following lines and remove or comment them out, you can use Ctrl+W in nano to find:
Note: XML comments are as follow:<-- Comment -->
Save with Ctrl+X, Y, Enter (if you’re using nano) and restart OpenBox (Preferences -> OpenBox Config -> Restart) and all should be done.
