Rotate Pattern Left    ⌃⌥⌘←

Shift the pattern to the left. The first step becomes the last.

Modify Step Sequencer pattern playback in Logic Pro — Apple Support

Some options in Step Sequencer control how and when steps play back, and can be fun to manipulate while the pattern is playing. For example, you can mute and solo rows, rotate rows (moving all steps in a row left or right, including their step values and other edit mode settings), and change the playback mode for the pattern or for a row, and perform other actions while the pattern is playing. In addition to controls and menu items, Step Sequencer includes a collection of key commands to facilitate making these and other changes in real time, see Step Sequencer key commands.