This is a known issue in the app center. You can launch WPS Office in 3 ways:
- On the desktop, search for WPS
- In the App Center, search for WPS
- Open a Terminal window and run these three commands to add the icons to the desktop:
eos-add-to-desktop com.wps.Office.wps
eos-add-to-desktop com.wps.Office.wpp
eos-add-to-desktop com.wps.Office.et