As a F-visa holder, you are considered as a nonresident for five years from the first year you entered the US. In your situation, you are a nonresident for 2015-2019. As a nonresident, you are required to file a Form 1040-NR. As TurboTax does not support any nonresident tax forms, you are advised to use Sprintax to file your Form 1040-NR to report your US source income including your Form 1099-B.
I first entered US in Aug 2015. I am on F-1 visa since then. Currently, on F1-OPT.
Regarding the form 1099-B, I noticed that I could easily import my tax document (generated by Robinhood) into Turbo Tax just using my Robinhood account number. I just have to fill in the individual stock buy/sell entry in Sprint tax.
As a F-visa holder, you are considered as a nonresident for five years from the first year you entered the US. In your situation, you are a nonresident for 2015-2019. As a nonresident, you are required to file a Form 1040-NR. As TurboTax does not support any nonresident tax forms, you are advised to use Sprintax to file your Form 1040-NR to report your US source income including your Form 1099-B.