The main view into a sequence document is the multiple sequence editor window, which lists sequence names to the left and sequence bases as one line that can be scrolled thru. Bases can be colored (now only nucleic colorings) or black. Sequence can be editted here, especially to align them, and subranges and subgroupings can be selected for further operations or analysis. Entire sequence(s) can be cut/copied/pasted by selecting the left name(s). Mouse-down selects one. Shift-mouse down selects many in group, Command-mouse down selects many unconnected. Double click name to open single sequence view. Select name, then grab and move up or down to relocate.
Select the lock/unlock button at the view top to lock/unlock text editting in the sequence line. With lock on (no editting) you can use shift and command mouse to select a subrange of sequences to operate on.
Bases can be slid to left and right, like beads on an abacus, when the edit lock is On (now default). Select a base or group of bases (over one or several sequences), using mouse, shift+mouse, option+mouse, command+mouse. Then grab selected bases with mouse (mouse up, then mouse down on selection), and slide to left or right. Indels "-" or spacing on ends "." will be added and squeezed out as needed to slide the bases. See also the "Degap" menu selection to remove all gaps thus entered from a sequence.