If I hide a layer and then share the sheet with my sub, will they still be able to see all of the measurements?

No. Only the measurements visible to you at the time of sharing will be included in the file shared with your sub. This means if you have any layers hidden at the time you print or share the sheet, the takeoffs added to that layer will not be visible. 

Conversely, if you wish to hide certain measurements on sheets you are sharing with other project team members, ensure the layers those measurements are added to have been hidden by marking the eye icon 👁️ next to each layer you wish to hide. 

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