Install the extension "Clang Power Tools 2022"

In the solution explorer dock widget, right-click on your solution, then click "Clang Power Tools" > "Settings" menu entries

In the "Format" tab :

1. "Assume filename" = .clang-format (I do have a .clang-format file in the top-level directory of my project)

2. "Style" = file

3. "Format on save" = on

Profit