Hi Michael23564157plek,
Thank you for reaching out, and sorry for the trouble caused.
The feature "Reopen from the last session" works only for the PDFs you open and worked on in the last session. To clarify, if you open 5 files today, work on them, and then close them before closing the application, they will not open in the next session. Only the PDFs you are working on and you close the application directly will open the next time.
For more information, refer to the information in the following help document: https://adobe.ly/4hMyQsQ.
Let us know if that is not the case, or if you need any help.
Thanks,
Meenakshi
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