Hello Francesco,
the merge command has no icon/button in moi, it seems that you have used the join command. That will copy the edges and join the copy together - not that what you want.
So hit the tab button of your keyboard - the cursor will jump into the field where the coordinates normally are displayed (lower window border in the middle). Now you can type commands here- in this case merge - close with enter.
Give your keyboard a chance;-)
- Karsten
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