If you open a SCH LIB or a PCB LIB component or footprint, in order to modify it and save it with another name, when you "save as" that LIB with the new name, it opens a new tab with the new name, but the old tab remains with the old name and the content of the new name and no asterisk (*), which is false because if you close that tab and open it again the old name it shows the old content. This can be confusing if you forget to close the tabs and open them again before make another changes or if you want to compare the old and the new content. The correct way it should work is: When you "save as", it sould NOT open a new tab, only replace the name in the same tab and remove the asterisk (*).