hi because the project support multiple pages/sheets, and the sheets are at the left-bottom corner the top tab only show the project name not sheet name

no excuse, your project layout does not support multiple sheets, with respect to usability, every project has 1 sheet and 1 PCB and only ever 1 sheet and 1 PCB, even when people want multiple sheets they cannot use them since everyone that wants multiple sheets wants to no why they cant have multiple PCBs to go with there multiple sheets. the entire multiple sheet structure is also a big BUG in your software, its is a wast of time and nobody cares about your multiple sheets since it does not do anything useful. why would anyone want to split up there schematic into peace's so they cannot find anything, unless of cause it was because each schematic was of a different PCB? ohh yes that's right, all projects have to be built on the same PCB my mistake. Go and find me pretty much any product on the market today that only has 1 PCB to build it, anything, open your printer next to you and tell me they built the entire circuit on 1 PCB ITS A BUG AND YOU NEED TO FIX IT NOT MAKE EXCUSES AND LEAVE EVERYONE STRUGGLE