https://support.google.com/accounts/answer/32050?hl=en&co=GENIE.Platform%3DDesktop
Issue: Check-In Theme Not Refreshing
If the check-in screen is showing an outdated theme, old branding, or layout glitches, the computer's browser has likely cached the old version of the page. Clearing the cache forces the browser to download the most up-to-date version.
How to Clear the Cache
Google Chrome (Windows & Mac):
Click the three vertical dots in the top-right corner of the browser.
Find Delete Browsing Data in menu
Select a time range (last hour should be fine).
Checked boxes are already set.
Click Clear data.
Refresh the check-in page.
Official Guide
For step-by-step instructions directly from Google, you can also share or reference the official Google Account Help Guide.