How to use fractional scaling without loss of resolution

Hello, I bought a secondary screen for my laptop and the problem is that the screen ratio is not identical to that of my laptop. My laptop has a 3:2 aspect ratio whereas screen 2 is a 16:9. The scaling doesn’t match well between my computer and my second screen. So I have to use fractional scaling, but when I use it, I get a big loss of resolution on the third-party software I use like Opera or Thunderbird.
Is there any way to remedy this?

Thanks in advance for any help.

The blurry apps are using X via XWayland.

I presume Thunderbird is a flatpak, since the Fedora package should use Wayland by default. You can enable fallback-x11 in Flatseal to make it use Wayland.

For Opera, you need to enable the wayland permission if it’s a flatpak. Then go to opera://flags/#ozone-platform-hint and set that to ‘Auto’.

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“Resolution” is the wrong word to use here, you probably mean text sharpness? Also the aspect ratio doesn’t matter, just the display resolution. If it’s high, everything is small.

Some topics to reference: