Heya some things to try:
Open Nvidia control panel > Manage 3D Settings > Program settings.
Select Apex legends in the drop box, highlight the image Sharpening setting and make sure its turned off.
Highlight the Multi-Frame Sampled AA (MFAA) and turn it on or if already on turn it off.
Apply and start Apex.
Ensure your render resolution is the same as your display resolution in Apex.
Then test the game