There’s a long-standing bug in Fedora (also in Fedora 40), where the sign-in screen is displayed at the wrong resolution (it doesn’t use the settings you have set in the Settings app).
So, for example, if you have 4K@2x set in your settings for your monitor, the sign-in screen will still display at a tiny 4K@1x.
To fix, download an app called GDM Settings from the Software app and press Display → Apply current display settings → Apply.
Is this just me? For the last couple of days, if I visit a link to a Twitter profile/page/whatever, it refuses to let me see it, prompting me to sign in. If I close the login widget, it redirects to the front page.
For a site having trouble attracting advertisers and keeping users, it seems odd to completely block everyone who isn't already a signed-in account holder.