How can I get back to G2?

I want to save the file made with Glyph 3 in Format 2.
I deleted all kerning settings but there is this error when saving:
Can’t save RTL kerning in format 2.

Switch to RTL mode in Edit View Bildschirmfoto 2021-05-01 um 11.22.38 to see RTL kerning pairs in the Kerning window, or LTR mode to see LTR pairs.

For transferring kerning between Glyphs 3 and 2, see:

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