In your case, if the hotkeys are no longer effective within the virtual machine and the impact is on the physical computer itself, this means that you are required to modify the configured settings, and reverted them back to default. You can also configure the Hyper-V to accept the hotkeys within the virtual machines only when the virtual machines are opened in the full-screen mode.
However it is always a good idea to revert the settings back to default where the virtual machines always accept the hotkeys regardless of their screen mode.
Here’s how you can configure Windows Server 2012 Hyper-V to effect the hotkeys within the
- Using the appropriate account that has the required privileges, log on to the Windows Server 2012 computer on which the Hyper-V role is installed.
- If not already started, initialize the Server Manager window from the bottom left corner of the screen.
- Once the Server Manager window is initialized, from the left pane, click to select the Hyper-V category.
- From the right pane, under the SERVERS section, right-click the Hyper-V server from the available list.
- From the context menu that appears, click the Hyper-V Manager option.
- On the opened Hyper-V Manager snap-in, from the left pane, right-click the name of the server. (DC-01 for this demonstration.).
- From the context menu, make sure that the service is started and all the contextual options are visible. If the service is not started, you must click the Start Service option from the context menu, and then right-click the server name again.
- From the context menu, this time click the Hyper-V Settings option.
- On the opened settings box, from the left pane, under the User section, click to select the Keyboard category.
- From the right pane, click to select the Use on the virtual machine radio button.
- Once done, click OK to save the changes.
- Back on the Hyper-V Manager snap-in, start the virtual machines to check the modified settings.