Luis,
The additional settings to change the Tomcat deployment location are available when configuring an external Tomcat server. The embedded Tomcat server is for quickly deploying applications without any additional configuration so the option to change the deploy path is not available with it.
Please refer to this tutorial for Tomcat support with MyEclipse : https://www.genuitec.com/docs/servers/tomcat-server/
If you need to change the deploy path, then you can download and configure an external Tomcat server instead of using the embedded server.
Hope this helps. Please let us know if you have any further questions.
–Swapna
Genuitec Support