Retirement tax questions

Sorry, I have Windows Home & Business.  I can't get it to show me any screens saying 19,500.  Are you using the 2022 program?  Try doing another update.  Go up to the top black menu bar Online then check for updates.

 

I don't understand this section.  I put in 300,000 of schedule C income and it says I can contribute 67,500 to qualified plans.  I put in 22,000 for individual 401k and did not get any error.  And it says the max you can defer to all your 401k plans is 27,000.  Where did it get that amount?