I simply want to delete those things that are selected, edges and face. I removed doubles, tried every option which offers when I press "x" but with some options nothing happens, and with some all mesh above this gets messed up.
3 Answers
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1
Select only the edges you want to delete and Right-Click > Dissolve Edges.
You have one excess edge selected, which forms top of a face
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I have Blender 3.2?
For my case, I solved it by selecting that edge and deleting again and again numerous times e.g. 5-10 times per edge until it get deleted.
Hope that helps.