Configure your Loser Bracket
A Double-Elimination, as the name states, is composed of a dual bracket, an Upper one (for winning participants) and a Lower one (for participants having lost a match), referred to as Winners and Losers brackets.
Would it be because your structure follows specific rules, or a personal wish to change, or even randomize, the matches being played in the Losers Bracket, you may want to edit the placement of participants in this particular setting.
To do so, go to your Structure menu, click on the of the stage you want to edit and then "Configure Bracket":
What you see next is a visualization of the bracket, with seeds. If some of them are locked, it's because results have already been entered in the corresponding matches, making changes impossible.
You can then click on any free Seed, to swap it with another Seed from the same round. This will modify the structure so as to keep matches aligned correctly, so order of matches may not correspond to their ID anymore.
Let's say you want to swap Seeds #1 and #4 in a standard Double-Elimination Bracket:
After the swap is effective, you will see the corresponding matches highlighted in green, to remind you of the change you just made.
As you probably noticed, you can also change the position of seeds in the Winners Bracket, and even in a Single-Elimination Bracket, with the same method and result.