On my main PC my WinSxS folder increased to 28GB, to check it can be cleaned run the following from an elevated command prompt:

Dism.exe /online /Cleanup-Image /AnalyzeComponentStore


Component Store (WinSxS) information:

Windows Explorer Reported Size of Component Store : 9.13 GB

Actual Size of Component Store : 7.97 GB

Shared with Windows : 6.06 GB
 Backups and Disabled Features : 1.63 GB
 Cache and Temporary Data : 265.06 MB

Date of Last Cleanup : 2017-09-06 10:19:03

Number of Reclaimable Packages : 2
Component Store Cleanup Recommended : Yes

If the output indicates a cleanup is recommended, then run:

Dism.exe /online /Cleanup-Image /StartComponentCleanup

This command takes a while, but my WinSxs folder is now 7GB.