Brave opening sites in mobile mode on Win10 desktop

When I open most sites in Brave on my Lenovo Yoga running Win 10 (Windows 10, version 20H2) - they open in mobile mode. However, when I reload the pages, they open in desktop mode.
Please advise.

Description of the issue:
How can this issue be reproduced?

Expected result:

Brave Version( check About Brave):
Version 1.18.70 Chromium: 87.0.4280.101 (Official Build) (64-bit)

Additional Information:

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