Read this link:
https://github.com/ValveSoftware/steam-for-linux/issues/9460
it looks fedora 37 is OK
i can not report this issue to fedora team cause i lost fedora account, maybe you can report it
Steam UI font error
Issue transferred from https://github.com/ValveSoftware/steam-for-linux/issues/9460.
@LiSiaoCheng posted on 2023-05-05T01:11:42:
/#### Your system information
I found that when I set the language of the Steam UI from English to Simplified Chinese, there will be font errors in the Steam UI ,it will be displayed as square frame .
OS:Fedora 38 (Workstation Edition)(64 bit)
Steam languages set Simplified Chinese
Issue Capture:

Fixed it by changing the fonts config.
According to two posts:
Another better way to fix it:
https://bugzilla.redhat.com/show_bug.cgi?id=2188765
It seems Steam does not support variable fonts yet.
replace vf package with normal fonts to fix the problem
sudo dnf remove google-noto-sans-cjk-vf-fonts
sudo dnf install google-noto-sans-cjk-fonts
This issue is tracked by rhbz#2240646.
Your system information
Please describe your issue in as much detail as possible:
The Chinese font is displaying incorrectly and cannot show Chinese characters properly.

Steps for reproducing this issue:
1.Update the system to Fedora Workstation 38.