It’s a whole separate instance of chromium running to support the one app vs one instance of your browser running all of your websites and apps. I run Outlook,

It’s a whole separate instance of chromium running to support the one app vs one instance of your browser running all of your websites and apps. I run Outlook, Slack (multiple instances), Teams, and Todoist as tabs in my browser rather than apps, and the experience is much better than using the native apps.