After the rollout of feature 85691 we seem to have lost the ability to switch to large gallery view on VMWare VDI. The menu item is there but is always greyed out. It worked prior to this rollout.
Microsoft Teams: Multi-Window support for VDI for VMware
Users on virtual desktop infrastructure (VDI)will be able to view meetings and calls in separate windows from the main Microsoft Teams client. Additionally, meeting and call controls such as mute, video, chat, leave and others will now be located at the top of the meeting window so that they are always available and never block the underlying content.
Feature ID: 85691 Added to roadmap: 8/11/2021 Last modified: 5/16/2022 Product(s): Microsoft Teams Cloud instance(s): Worldwide (Standard Multi-Tenant) Platform(s): Desktop Release phase(s): General Availability