We uncovered pine flooring in our 1859 built house it was covered with carpet and ply wood which we removed to find leveling compound. Is there any way to remove the compound short of just scraping with putty knife?
I don’t know of any other way of removing leveling compound other than with a chisel and a hammer. It can be pretty hard to get this stuff removed. You might want to have the compound checked for asbestos if you feel that it was installed before 1978. There is a chance it might contain asbestos.
Good luck on your remodeling project.