As described in this issue, using one of our One UI libraries (both sesl and the old Design lib) will cause issues with the Android Studio Layout Editor. This happens because Samsung's text styles use a custom fontFamily which is not available on AOSP. This repository contains a Samsung fonts pack that needs to be added to the AOSP ones included in Android Studio.
Download the repo archive and extract it.
Navigate to the "plugins/design-tools/resources/layoutlib/data/fonts" directory inside your Android Studio folder, then:
Before proceeding, make a backup of this "fonts" folder first as you need to (temporarily) restore this everytime you need update Android Studio
- Add the all "*.tff" files from the "secfonts" folder of the downloaded archive.
- Open the "fonts.xml" file and append to inside the
<familyset>tag the contents from inside<familyset>tag of the "fonts.xml" found inside "secfonts" folder.
For Windows, you can run SecFontsFix.ps1 in Windows PowerShell to automatically perform the above
including backing and and restoring the original "fonts" directory.