Samsung Galaxy S8+ mobile hotspot to laptop security query

Hi. I’m in the UK.
I use a Samsung Galaxy S8+ (android version 9 and up to date on updates)
I rely on using the phone as a mobile hotspot to my laptop (no wifi here)
The laptop is approx 8 years old, and purchased as used. I have to send sensitive documents to my laptop, and I’m concerned about security.

The phone’s mobile hotspot settings has a password in place, but I worry that neighbours could see stuff here.
Being an older very non-tech person, could someone help please?

Thank you

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