I have a plane consisting of 4 squares - take as an example a subdivided plane. How can I merge these faces into one?
I found that it is sometime more efficient to use x in edit mode then Disolve edge.
Let's convert this curve into mesh with ALT+ C:
You end up with the following mesh.
This mesh will be hard to process because it has holes. for example, f simply doesn't work. Using Limited disolve will not work well too, here is the best result I can get using this method :
Disolve edge is interesting because you can process the mesh multiple times without changing the whole shape. Here is the result I obtain after two Disolve Edge :