locking a mask in position

hello
ive only recently started using darktable , so i am on a very steep learning curve , and have been watching Boris s excellent tutorials , on one of them he locks a drawn mask in position so it cannot move using a keyboard shortcut , i did not make a note of this and cannot find the video it was on again , a internet search does not bring anything up , could anyone tell me how to do this ? thankyou

https://docs.darktable.org/usermanual/4.6/en/darkroom/masking-and-blending/masks/drawn/#editing-shapes

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thanks thats just what i wanted to know , did a search in user manual but nothing came up .

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