1040 Sr, where do I find that?

The 1040SR is the form that is automatically used for you if you were 65 or older at the end of 2021.   It is exactly the same as "regular" Form 1040 but the print is bigger.

If you start entering data in this software you are preparing a Form 1040.   Please look at it so you will know what you are sending to the IRS:

PREVIEW 1040

https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing

Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.

It is just the 1040 form with larger print for senior citizens.  It will come out automatically if you are a senior citizen.