Hi annissa,
Do another restart, this time into Safe Mode.
Click Restart in the Apple menu, wait while your Mac shuts down, then restarts.
As soon as you hear the startup chime, press and hold the shift key, releasing it when the screen shows the Log in page.
Log in, launch Pages and test to see if the issue persists.
Log in to Safe mode will take longer than usual, as the Mac calls more housecleaning routines. You'll also notice a degradation of video performance.
After testing, Restart again, this time just a 'regular' restart, and retest Pages behaviour.
More information regarding Safe Mode here: How to use safe mode on your Mac - Apple Support
Regards,
Barry