Forward keys not available on LINUX!!

Hi. I'm facing an issue about Teamviewer for linux.

My version is the 14.1.3399 and it doesn't have any option to forward keys.

My system is Debian 9 with LXDE

I need to send a ALT+F4 to a remote computer and on screen keyboard isn't a option.

Any solution please.

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Also not working on Ubuntu 18.1 with TV 14.1.9025.
alt-f4 is hardcoded in my muscle memory so I'm loosing my session like every minute,

It's not something that the OS is blocking. The Remmina RDP client has no problems grabbing and forwarding the system keys so it should be possible.