W10 in tablet - screen keyboard broblem?

Hello everybody,
I want to use Inteset Secure Lockdown with W10, that runs in tablet.
So I've installed trial version of the Inteset Secure Lockdown sw.
After set up Secure Lockdown, all runs OK then I've use external keyboard.
However I don't know how to insert keystrokes with "Alt" or "Ctr" key,
since there aren't on the tablet screen keyboard, then I use "W10 tablet" mode of course.
And the second problem, I don't know how invoke the keyboard then the "task bar" is hidden
after starting Inteset Secure Lockdown.
Could you give me an advice how to solve the problems above?
Thank you for your cooperation.
Enjoy the rest of your day
Peter B.

Windows 10 has a virtual keyboard Compatibility Mode option that provides all standard keys. See the bottom right corner icon (looks like a keyboard) of the abbreviated Windows 10 virtual keyboard to change the mode.

Thank you very much for your advice. Tablet is totally a new IT system for me,
there are two type of the keyboard in tablet - one is complete (with Ctr, Alt, F1, F2, etc.)
and second one has only letters and number key. And I haven't had enabled keyboard with
standards (default, complete) keys lay-out. This property is necessary set up in W10 operating
system setting. Note: Without this setting there is only gray (nonfunctional) keyboard icon in
tablet.
Thank you for your time, enjoy the rest of your day.

You can gain access to the "standard keyboard view" by enabling the Windows Settings > Devices > Typing > Add the standard keyboard layout as a touch keyboard option