Remove edit in sharepoint designer Option SharePoint Online

SharePoint Designer Settings in Site Settings is the Option you are looking for. Here you can simply uncheck "Enable SharePoint Designer" option to restrict editing SharePoint site in Designer. This however, does not remove "Edit in Designer Option" in Site Actions, Instead it just does not let a user to Edit the site in designer. To remove the option completely you can create a fetaure with Custom Action "HideCustomAction" and deploy it in your SharePoint Online site.

I will post my experiences about doing this soon.