Welcome! 
I wrote a guide recently on misbehaving USB devices:
Try installing libusb-dev (sudo apt install libusb-dev in terminal), reboot, and then try the mouse again..
That package includes extra drivers and support for a multitude of USB devices that may or may not need the extras. For me, it's a reaction install after the OS install - just to make sure there are reduced mishaps 
What brand / model is the mouse; do you happen to know? Again, in terminal - issue lsusb and post the output with the dongle in the USB port. That'll give a hardware ID; might have a quirk to that device that needs an extra push to get going.