seps@wanadoo.es,
1) Which version of MyEclipse are you working with ?
2) If you have detached a particular frame , you can right click on the top of the frame and uncheck ‘detached’ to add it to the main window.
Attached is a screenshot for your reference.
3) You can also reset the perspective to defaults from the menu Window > Reset Perspective.
4) If the above suggestions do not work, then please attach a screenshot of your workspace for me to understand it better. Here is an FAQ on how to upload attachments to forums : https://www.genuitec.com/forums/topic/troubleshooting-how-to-upload-attachments-on-forum/
Let me know how this works for you.
Attachments:
You must be
logged in to view attached files.