What are you downloading to? A computer or phone or ?? It should be in a .pdf file of your whole tax return unless you downloaded the tax data file that end in .tax2023. On a Windows computer the pdf file should go into your Downloads folder or look for it a Recent folder. If you have Windows it might save it in OneDrive. Windows has a habit of saving files there.
Or search for all pdf files. It might be named like....
2023 Smith {first name initial} Form 1040 Individual Tax Return.pdf