Hello Mr. Sutariya, I've moved your question to the PADS layout sub-community where a quick response is more likely. -Cathy Terwedow
It is inactive because there is still items on that layer. They could even be embedded in a decal. Once everything is deleted the delete layer will be active. Usually when I hit this problem, I check that all items on that layer have color assigned, run integrity check, ascii out and in, open in router save and reopen in layout. The previous steps usually fixes any database issues. By then I can usually find the item on that layer.