Is it possible to change the screen resolution after fully booting the Arch Linux installation medium? I tried to add
vga=795 to the boot line, and that worked for a few lines before the resolution was changed back to an unreadable 4K. And the various suggestions in the wiki seem to assume that I have already set up networking and can install packages.
With the help of a guide to the default console fonts I was able to set the largest available using
setfont /usr/share/consolefonts/iso01-12x22.psfu.gz, but that is still barely readable.