To share the presentation with Chrome browser you need to press Share screen icon.
When presenting with the browser for the first time, the popup window will appear.
Google Webstore will open on Pexip Screensharing Extension site.
Click Add to Chrome.
Pexip Screensharing Extension popup appears.
Press Add Extension.
Now extension is installed. Press once again Share Screen icon
Allow Extension for conferencing.
Select the windows you want to share and press Share.