Installation screen cut off when installing Ubuntu in VirtualBox

I have Ubuntu 21.10 with VirtualBox 6.1.26. I am trying to install Ubuntu 21.10 in a virtual machine. When I choose English as installation language, the keyboard selection screen looks like this:

As you see the lower edge is cut off - but it is still possible to go on with this.

However when I choose Japanese as installation language, the keyboard selection screen looks like this: The buttons quit, back, continue are not visible. The right edge is cut off as well as the lower edge.

The same happens on the following screens. How can I get a larger screen during installation?

EDIT: The following happened when I followed @pasman pasmański's suggestion. The first few installation screens were ok but then suddenly the live system fell back to the low resolution:

But here the solution suggested in the second answer is working which helps to go through the remaining input screens.

EDIT2:

As @gronostaj suggested I tried to change the resolution once more, and then it goes on with this.

This seems to be a bug of great glossy cool Yaru theme. It uses vertical space very effective, no doubt.

About the installer window - you can hold Alt+F7 to move its window by mouse.

Virtualbox sets screen resolution 800x600 which is below minimal requirements for Ubuntu. In installer press Try Ubuntu button, go to Settings->Displays->Resolution and select 1600x900 or more. Then you may continue installation.