recently i found that the estimates are disappeared from the screen
the menu is still exist but when click on it no data appears, even when i created a new one
the new Estimate form also doesn't appear
Can you share a screenshot of your Estimates page? It might be related to your browser's cache, so I start by trying to clear it. If you aren't already using Chrome or Firefox, I would also recommend using one of those. They tend to be the most stable.