Hi thanks again for replying, is there any way to fix this? Even with the screen set to default or with the document set to the screen's profile Affinity changes the image too much to know what colour it will be once exported. Shouldn't the app show correct colours with everything on the program and on the OS set to sRGB?
edit:
actually ignore that, I just needed to close and re-open the program again (duh!) thank you!
For anyone reading this in the future, before making a new document go to edit > preferences > colour, and set the RGB colour profile to sRGB. When you make a new document (File > new) set the colour profile there to the same as you have set in Microsoft Colour Control Panel. When you export the image, (file > export) click More then untick Embed ICC Profile