So it's a known issue for KDE: https://bugs.kde.org/show_bug.cgi?id=510225 .

The feedback from KDE developer is that they won't implement any workaround, so Wayland support needs to be added/fixed in other components, namely spice-vdagent or open-vm-tools.

If using a Linux host, and running your Kali VM via QEMU, then it's spice-vdagent that is in charge of making it work. The issue is, again, known upstream:

• https://gitlab.freedesktop.org/spice/linux/vd_agent/-/work_items/26
• https://gitlab.freedesktop.org/spice/linux/vd_agent/-/work_items/46

If using VMware, then it's open-vm-tools that needs to be fixed. Again, known issue, cf. https://github.com/vmware/open-vm-tools/issues/792. People over there mention that it's been a decade since the issue was first reported, so don't hold your breathe.

Workarounds

Some people say that it works with latest versions of VirtualBox, if ever that's an option for you.

Alternatively, stop using the KDE edition of Kali, instead use another desktop environment:

• GNOME is known to work (because they've implemented a workaround for this issue)
• Xfce also works because it's still using X11, but that won't last forever (they're actively working on Wayland support)