Strobe

Mapping: for strobe to work as intended you need to select a canvas set up in a specific way.
Delay: delay between the individual flashes. The lower it is, the faster the strobe effect.
Spread: the spread of individual flashes. The higher this number is, more of the screens will flash at the same time.
Number of screens: type in how many screens you want the strobe effect to apply to.
Strobe color: color of the strobe effect.
Auto rename: select if you want the layer's name to display the state of the variables.

1. Inserting the layer

Right click in the Timeline, select Generative category and choose Strobe layer

With the shortcut

Hold O and click in the timeline with the left mouse button

2. Choosing the canvas

For strobe layer to work as intended, it needs to be mapped to a canvas.

You can select the canvas through a dropdown.

Drag & drop

If you drag a canvas onto any layer that has a Mapping variable in it, that variable is going to get assigned to the dragged asset.

DMX or Curves

You can also control the selected asset with the flags on the right of the variable.

3. Setting up the canvas

The canvas needs to be split into as many subareas as there are video screens. (Number of screens variable). The size of the subareas needs to be identical.