For editors/painters displayed as tabs in the InfoMaker IDE window, a setting called NewTabAtRightMost is supported in the IM.INI file. It determines whether a painter/editor is opened from the left most location or the right most location of the tab bar in the IDE.
[Tabbedbar] NewTabAtRightMost=0 //0: left most location. 1: default value, right most location.
The indicator at the right end of the tab bar will show differently when the bar has not enough space to show the header of all of the opened windows.
The icon () indicates there are opened windows invisible from the tab bar; and the user can click the icon and select to display the invisible window from the list. The icon () indicates all opened windows are visible from the tab bar; the user can click to switch the windows.