You can override the global Repeater settings selected in the Settings dialog for an individual tab.
To configure tab-specific settings:
If you select a setting on the tab-specific menu then Repeater ignores all global settings for that tab. Make sure that all settings are configured correctly on the tab-specific menu before you send requests from the tab. For example, if you select Process cookies in redirections on the global Repeater menu, and Enable HTTP/1 connection reuse on a tab-specific menu, the global Process cookies in redirections setting is ignored.
If you modify settings for a tab, the tab's settings icon turns blue. To return a tab to the global Repeater settings, click its settings icon next to the Send button and select Restore global default from the context menu.
If you use a project file, any tab-specific settings you configure for open tabs are retained when you re-open Burp Suite.