'Direct Dial' icon - how?

I recently had to reset my Umidigi Bison to factory defaults,
fortunately I have very few added apps or other customisations so it
didn't take me long to restore most things.

However I can't get my 'direct dial' icons working again, these were
two buttons on my main page which dialled 'Home' and 'Wife' directly
by just clicking the button.

I have Nova Launcher installed and I seem to rememeber that was
involved somehow, but I can't see how at the moment.

Can anyone help please?  (..., it's running Android 11 if that might
be relevant)

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Chris Green
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