I have a 4K screen. The default Brave font display is tiny

So to change the display to make it a little bigger first copy the .desktop file to the Desktop

cp /var/lib/flatpak/exports/share/applications/com.brave.Browser.desktop ~/Desktop/

then edit the Exec line in the .desktop file Exec line to include --force-device-scale-factor=1.4

Exec=/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=brave --file-forwarding com.brave.Browser --force-device-scale-factor=1.4 @@u %U @@