Affinity file suddenly has low resolution

[syra]

Hello, this is my first post. I'm hoping to get some information on how to fix this issue I'm having. Thanks in advance for any help.

I have an affinity project file with many layers. Everything was high res until one day, it wasn't. Now everything looks pixelated when I zoom in. Does that sound familiar? Did I press something I shouldn't? Is it reversible?

Thanks again.

[firstdefence]

Welcome to the forum syra, 

Which app are you using and which Operating System are you on?

What should the document settings be and what are they now?

[DWright]

Is it possible to attach a screen shot or a copy of your file for us to look at.

[markw]

If you are using Designer and working with vector objects, it’s possible that you may have accidentally toggled one of the Pixel View modes in the top Toolbar.
These view modes are used to see how your vector work will look when rendered as pixels, say as a .jpeg export for example.
In the attached screenshot the left Pixel View button has been activated as indicated by it’s darker colour. To deactivate, just click it again.