I did some researches but I didn't find what the "Control port" is using for. (TCP port) Can someone help me ? (Sorry for the dumb question)

The main listening port is where the web application is published (example: http://example.com:1990/confluence, where 1990 is the port). Webapps are usually deployed on 80, because you can then remove it from the URL.The control port is used by Tomcat (the web server). Tomcat's utilities can use it to start/stop/monitor the instance.

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What is "Control port"

Duplicate draw.io diagram tab gives "Illegal Constructor" message

I have a diagram with 2 tabs names "Option A" and "Option B". When trying to duplicate wither of the tabs I get a popup stating "Illegal Constructor".

The message in the popup is different depending on which browser I use.

Chrome: "Illegal Constructor"

Safari: "function is not a constructor (evaluating 'new a.constructor')"

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The main listening port is where the web application is published (example: http://example.com:1990/confluence, where 1990 is the port). Webapps are usually deployed on 80, because you can then remove it from the URL.
The control port is used by Tomcat (the web server). Tomcat's utilities can use it to start/stop/monitor the instance.