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enter image description here Got the latest version of blender (2.90.1) As you can see, i didn't subdivided any faces more than another, however some faces would correctly merge while some others would stop merging in the middle (picture 1). Even when creating an edge between the two points, the edge would just be raised but not the face, it wouldn't fill the gap in betweenenter image description here (picture 2). I also tried pressing F to fix it but it gives me the "canno't merge face" error (please forgive my english). Could someone help me please ? Maybe do i need to use an older version of blender ?

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  • $\begingroup$ F is to "fill" between 2 things.. verts, edges or faces. Use J to join to verts with an edge. $\endgroup$
    – Geri
    Commented Nov 23, 2020 at 14:29

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You can't do what you're trying to do with this kind of topology. Actually, in 3D, faces are always made of triangles, for example a quad is made of 2 triangles:

enter image description here

If I move up the top right vertex the line between the triangles will rise up, like you would like in your example:

enter image description here

But if I move the top left vertex it will stay flat:

enter image description here

So in your case, you need to add topology, like that:

enter image description here

To join 2 vertices through a face you need to press J rather than F, F will simply create an edge between 2 vertices over the existing face, it won't cut the face.

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