That's odd behaviour. I'm not sure if the safety code is removed from the mouse version on Apps4Flip website. This issue used to happen long ago (I have a warning for this in the README on the project page: [Login to see the link]), but thanks to some folks there are safeguards that prevent this from happening in the latest version.
Thanks LB for suggesting resetting. That should definitely work.
Apart from this, if you're stuck and have a hardware mouse handy (the one used on desktop PCs), that can be connected to phone for enabling ADB (for me an OTG cable works). I don't have a flipphone so I don't know if it would work for a flipphone though.