I have made the mesh and added solidify modifier and applied. But later i thought to increase the thickness. So now i want to remove thickness so that i can added the solidify modifier again. I want to know is there any quick remove thicknes. When i select the edge then ctrl+ the selection goes downward not to single face. So i want to know a quick way to decrease thickness. Any suggestion or help.
You will need to manually select the edge loops around the boundary, still using the alt-click to select them in vertex select mode until they are all selected. Then you will need to change to face select mode, and delete the faces. Then you will need to select a face on the surface you want to delete and press L to select all linked faces and then delete them, leaving your original surface ready for editing.
If you have just applied the modifier, use Ctrl Z and cancel it with the "×" button. Use Ctrl- F > Solidify instead as you can readjust the thickness as many times as you want before you okay it.