A partial exclusion for change in employment  is handled in the home sale section of the interview so just follow the interview screens carefully.   Most important is that you indicate you got a 1099-S at the closing and click on that box ...

To report the sale of a primary personal residence -

• Click on Federal Taxes (Personal using Home and Business)
• Click on Wages and Income (Personal Income using Home and Business)
• Click on I'll choose what I work on (if shown)
• Scroll down to Less Common Income
• On Sale of Home (gain or loss), click the start or update button

Rollover of your capital gain into your new home - that option was taken out of the Tax Code a long time ago.

How much profit do you have after 18 months?

Don't forget to adjust for closing costs.

For work-related moves see https://www.irs.gov/publications/p523#en_US_2020_publink100073097