Ha Floor Planner Troubleshooting?

Hey all,
I am new to using HA Floor plan and recently came across bitborn videos for floorplan. In these videos, I noticed the use of a code called “use” in the SVG file. Can you please guide me on where to find more information about this code and how it is used in floorplan? Thank you.

link for the video: Home Assistant Floorplan SVG Inkscape - YouTube

I am currently using a above mentiontioned method to code the lights in my project. Is there a more efficient way to code and optimize my lights for better performance?

Additionally, is there a way to toggle the visibility of an element without using an entity, such as using a button to toggle grid lines?

Lastly, are there any universal or optimized codes for fans and air conditioners? I have noticed that the toggle function works in some cases, such as the Mushroom Card, but not in others, such as the HA Floor Planner tap-action. I am currently working on creating switch.yaml templates for this.

Sorry I don’t see what you are referring to in the picture above. You might also be best asking the YouTube creator?

The SVG format is a standard for vector drawings.
It is a bit out of the scope of HA, so you might need to look at other resources on the internet, like <use> - SVG: Scalable Vector Graphics | MDN