As most of the above.
The aircraft that has the runway is at the bottom, anything told to land after or line up behind we put on top in the runway bay.
Works the same way with the traffic circuit, first aircraft we always have on the bottom, 2, 3 and 4 on top, so we have the sequence directly visible, and only have to move them below into the runway bay when giving a landing clearance.
Same thing when vectoring doing approach work, once the sequence is figured out, strips are arranged accordingly, first at the bottom.
Though when working procedurally..... according to level, so we always have the next "conflict" apparent on the board when climbing/descending.
And when we do everything from one position...... a bit of everything.... procedural work on the top, radar work below, and pattern lowest.... Runway bay is the same.