"Thicken" function greyed out

Hello everyone.
On my SolidWorks 2021, the " Thicken " function, in " Insert, Bossing Base " remains grayed out, even if I select a face
Do you have the solution?
Thank you and have a great weekend.

Can you attach (screenshot) on which function (face, sheet, other...) Are you trying to apply this function?
Possibly this function cannot be thickened with the chosen function.

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Hello Viking,

The trick may be the following

For more help:
2021 Solidworks - Thicken

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