How to customize by copying save function from bottom bar next to standard selection

At the foot (bottom) of each LO page are a number of controls/selections at least one of which is not found in the standard menus or icon bars at the top of each page. I’m trying to find, in the customization list of controls, the icon (next to the standard selection icon) I suppose is a picture of an old floppy disk that changes from red to black when the document is saved. This color change does not occur in the standard “save” functions offered in the menu bars at the top of each page. I’ve looked through all the customization offerings and cannot find this particular changeable icon. Have I missed it? I would like to be able to insert that changeable icon into the upper part of the page, since the main “save” icon has lost that changeable character in the most recent update.