Multiple Mirror Modifiers

I’m working on a structure of many parts, most of which use a mirror modifier. Is there any way to turn them all on and off with just one click instead of going to each individual object and doing it?

In 3.6.5, enable the modifier tools addon that comes packaged with Blender. Click Toggle All at the top of the modifier stack.

In 4+, no idea, they changed the modifier UI completely

You could set up a driver on them, controlled from a custom property somewhere, or from a physical object in your scene. You only have to create one driver then copy and paste it over the other toggles

Multi-object editing just require to press Alt key while doing a change to apply setting change to all objects selected.
So, you just have to press Alt key, while clicking on modifier icon to disable/enable modifier of active object, to obtain result on modifiers having same name on all objects of selection.

Another solution may be to use an unique object to handle mirror modifier.
By joining parts mesh parts as one object, by using geometry nodes to join parts into on object or by using boolean operation.

Works perfectly, thank you.