To block Google’s before you continue popup on the main Google site add the following lines to uBlock Origin’s My filter tab:
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www.google.com###lb
www.google.com##:root:style(overflow-y: visible !important;)
src - https://www.ghacks.net/2020/09/27/how-to-deal-with-googles-and-youtubes-aggressive-popups-before-you-continue-sign-in/
origin - https://www.pipiscrew.com/?p=19123 deal-with-googles-and-youtubes-aggressive-popups