"Apply with LinkedIn" allows candidates that are viewing your application form to more easily fill in their details. When viewing a Workable application form, a button will appear which the candidate can click to have the application auto-populated with details from their LinkedIn profile.
You must have a full LinkedIn Recruiter account to set this up. The option to enable it can be found in your Linkedin Recruiter System Connect once it has been set up.
Accessing the setting
Visit the Integrations page under the settings page by clicking on your profile icon menu in the upper right. Then, navigate to the LinkedIn section and click Setup or view existing LinkedIn integrations. In the pop-up modal, you will be requested to sign in to your LinkedIn account if you haven't done so and you will then be able to request the "Apply with LinkedIn" feature.
When candidates start your application form, they will see an option to apply with their LinkedIn profile. If a candidate chooses this option their LinkedIn profile will be used to auto-populate the details on the application form.
The candidate will be able to change any of the pre-filled details and will still need to manually complete any custom application form questions that you have added.