If you drag a corner of the remote desktop window to resize it, a tooltip displays the screen resolution in the lower-right corner of the window.
If you are using the VMware Blast or PCoIP display protocol, the tooltip changes to show different screen resolutions when you change the size of the desktop window. This information is useful if you need to resize the remote desktop to a specific resolution.
You cannot change the resolution of the remote desktop window if an administrator has locked the guest size or if you are using the RDP display protocol. In these cases, the resolution tooltip shows the initial resolution.