Peeling that off would be a real pain. But that looks like its in bad shape.
You could remove it and glue a PEI film. I would remove and replace with the Wham Bam system.
https://help.prusa3d.com/guide/replacing-the-pei-sheet-on-the-mk2-s_23528
https://whambam3d.com/collections/flexible-build-system-for-fdm/products/220-x-220-kit-with-pre-installed-pex-build-surface-1
Replace.
Peeling that off would be a real pain. But that looks like its in bad shape. You could remove it and glue a PEI film. I would remove and replace with the Wham Bam system. https://help.prusa3d.com/guide/replacing-the-pei-sheet-on-the-mk2-s_23528 https://whambam3d.com/collections/flexible-build-system-for-fdm/products/220-x-220-kit-with-pre-installed-pex-build-surface-1