Short answer
HubSpot's KB: column changes you make apply to your browser only, saved as your Personal view. Columns can also be applied to all segments of an object. You can freeze up to three properties, including the primary display property.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
If teammates see different columns, it's usually a personal view.
3. Related
Saved views and segment folders.