When you click Multimonitor from the session toolbar, the session might not extend automatically. The issue occurs when you use Citrix Workspace app for HTML5 version that is earlier than 2404, and the Google Chromium browser version is equal to or greater than v125.0.0.

We recommend you update your Citrix Workspace App for HTML5 client to version 2404 or later to address the issue.

This has also been mentioned in the release notes for the HTML5 client. (https://docs.citrix.com/en-us/citrix-workspace-app-for-html5/about#2404)

If your browser version has not been updated, there is no need to take any action. Citrix Cloud customers do not need to take any action either.

Problem Cause

In a recent Chromium update (version 125 and later) the APIs used for Multi Monitor functionality have been changed. (https://chromiumdash.appspot.com/schedule)

Instructions for upgrading HTML5 client https://docs.citrix.com/en-us/citrix-workspace-app-for-html5/deploy.html#to-upgrade-citrix-workspace-app-for-html5-on-storefront