Start runs that segment's clock and stops anything else, so only one clock ever runs. Stop it during objection arguments. Tap a recorded time to correct it (type mm:ss). The small number on each row is the time that side has left after that segment, just like the paper sheet. Pretrial has its own clock and never touches the trial budget. Every witness comes with its redirect or recross already in place on the side that pays for it; an unused one stays at zero and is left off the copied sheet. Arrange lets you reorder, rename, add and delete rows. Everything saves in this browser, so a refresh mid-trial loses nothing.