You can escape the space by changing
toCode:Exec=/media/scout/5b08b33b-1011-4ff8-abbb-f77978ddc8ec/Standard Notes/standard-notes-3.5.11-linux-x86_64.AppImage
Note the character after "Standard"Code:Exec=/media/scout/5b08b33b-1011-4ff8-abbb-f77978ddc8ec/Standard\ Notes/standard-notes-3.5.11-linux-x86_64.AppImage
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