insepector not heighligthing on my site ):

Hi, try clicking the magnifying glass icon at the bottom of the window to open the inspector.

where is that icon ? https://ibb.co/zH8gbXt

The bottom panel appears to be missing. Try seeking out a working baseline by temporarily deactivating all plugins not authored by SiteOrigin. Does the issue resolve in that state?

should i deactivate all the plugins except your plugin?

Yes, temporarily deactivate all plugins except for SiteOrigin CSS to see if a working baseline can be established.