Is it possible to move between any nodes without using transition lines?

The lines are used to direct the flow. If you don't use lines the bot won't know what to do next (timeout is an exception)

that's right! you've got to use the transition to get to the next node - is there something specific you're trying to achieve?

You can also take a look here: and here: https://botpress.com/docs/cloud/toolbox/transition-to/

for example, in an extended workflow, you need to go to another flow and the indicated cart, without creating "execute a workflow", for optimization and transparency of the project, e.g. if you enter "S" go to start, BUT I'm not sure if my idea is useful...