How to replace unfound fonts?

Here we opened a DWG document, in which there are several files that used some unfound fonts. After these files are opened, the software could remind us that there are some unfound font files. Meanwhile, the replacement manipulation function is also offered. I do not replace them currently.

This is the Screen Capture of the open dialogue box.

We could obviously see that all the characters in this picture could not be displayed correctly. They are all displaced by “???”. We could click menu “Option” , then select Menu Item “Search path and font replace...” to enter the setting dialogue box.

Tick “Replace all the fonts that not found with the below fonts ”，we choose little font txt. Big font is hzdx. Click “apply”. Preview of replacement is as followed: