Let's take the Breadcrumbs block as an example. In order to disable breadcrumbs on the Auth and Profiles locations, you need to do the following:
- In the administration panel, go to Design > Layouts.
- Select the Auth or Profiles location (tab) that you want to disable breadcrumbs on.
- Click the Activate/Deactivate block icon of the Breadcrumbs block.
The block should become lighter.