The other posts are correct. A button template is for running button commands, like push or hold. If you don’t have a button device, it is not going to work that way.
You don't need that many buttons. You can create multiple button numbers on a single device. And the Button Controller app can keep all the "rules" grouped together.
3 physical buttons. Create 1 virtual button, That one virtual button will have 3 button states that i can use. Those 3 button states can action the 3 physical buttons.
I'm not sure what you mean with "physical" or "states." My suggestion is to create one virtual button device, set the number of buttons to whatever you need, then use Button Controller to create whatever automations you want in response to your desired combination (e.g., button 1 pushed, button 2 held, etc.).
You will likely find this out as you start to use it, but from your last screenshot, you might notice that under the "Button" column there is the number 1, if you choose to expand your BC rule to cover multiple buttons, e.g. 1, 2, 3, etc, then you will see these represented here with rows for each.
yea i created one virtual button with 21 buttons. And in Button Controller will make the rules for all of them. Then make it appear in dashboard as i want.
question, the DoubleTap and Held actions dont work via dashboard buttons
You must choose the button event that you want tapping the dashboard tile to do. This is chosen per tile, and the event is generated when you tap on the tile (same as performing any other simple action on other dashboard tiles) -- there is no "literal" double-tapping of the dashboard tile, just as there is also no pushing or holding. It's the event that you chose in the tile configuration.
In your case, you must have chosen "pushed." As I mentioned above, you can use any combination that you want -- e..g, for 21 different things, you don't need 21 buttons, but that might be the easiest way (for you) to do it. You could also use 7 buttons and 3 events from each, e.g., pushed, held, and released, or any combination that gives you enough different events to do however many different things you need.
