Current behavior:
Currently there is no option to make the in-context preview disabled for linguists

Available workaround:
Each user needs to open the job in the Editor and click on Tools > Preview > Disable

Requested behavior:
Add an option inside project settings to disable in-context preview in editors

Use case:
Sometimes in-context preview in Beta version (for example IDML files) may take longer time to load and slow the overall performance, so it would be good to disable it by default.