在字体选择时无法使用本地字体，只能看见系统自带的少量字体，原因不明
You can’t use the local font when you select the font, you can only see a small number of fonts that come with the system, for unknown reasons.
I think you are saying that fonts you installed are not in the list. You need to restart Shotcut after installing fonts in order to see them. If you did restart, then I do not have this problem. However, I am not using Chinese if that makes a difference. Probably someone who has the problem needs to fix it and send the code change request to our GitHub project.