MacOS Catalina 10.15.7 (Apple’s last ‘10’) and target work station Sublime Text 3.2.2 Build 3211 (almost sublime).
MacOS erase/reinstall with User\Library copy paste from other functioning Sublime Text work station. Packages are all in place, however Side Bar has issues related to Projects.
User Library supports Sublime remembering name of parent project Folder, placing EMPTY Project parent folder in Side Bar. However, the parent Folder in Side Bar is empty. Even though the fully populated Project Folder exists in source and target work station Finders. This issue could only exist if Sublime Text Folder allocation in macOS Catalina is NOT using User Library in a manner that supports portability.
Please establish portable Project allocation by moving FUNCTIONING Sublime Text Project data to Username\Library\Application Support\Sublime Text 3. Hopefully for Sublime Text 3 and all future versions. Allowing fully portable Packages and Projects in Sublime Text.