Note that this doesn’t adjust all the tracks to the same size - it only distributes equal changes in size “steps” to all tracks (i.e. if one track is one “step” larger than the rest, it will remain one “step” larger than the rest). A quick way to make all your tracks the same size is to use alt to collapse all of them (you can click the collapse button beside the track name) & then hold alt again to resize them to the width you want. Also keep in mind if you select multiple tracks using shift or cmd you can resize only the selected tracks, no alt required.