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The photos show that the Acer BIOS does detect the 256‑GB SSD, but “Windows Boot Manager” is missing from the empty boot-priority list. This normally indicates damaged/missing Windows boot files or a problem with the SSD—not simply an incorrect boot order. Leave Boot Mode: UEFI, Secure Boot: Enabled, and SATA Mode: RST with Optane unchanged. First press F9, confirm loading the BIOS defaults, then press F10 to save and restart, as recommended by Acer.
If the error remains, create a Windows installation USB on another computer, start the Acer from it using F12, and select Repair your computer > Troubleshoot > Advanced options > Startup Repair.
If Startup Repair cannot detect Windows or the SSD, the drive or its partitions may be damaged even though its model appears in BIOS. If important files are stored there, do not format or reinstall Windows; have the SSD checked and the files backed up first.
Please let me know the results so I can help you further.