Device tracker not showing new devices in card

my “home” was really messy and so i started using cards to group them.
now, my device tracker card is not showing new machines connected to my router. off course i do see new devices in the states at
any idea on how to code to have new devices auto populate in my devices card?

the closest i found is this Device tracker in Lovelace
and the syntax is wrong.
so i edit to this:

- type: entity-filter
    - domain: device_tracker
      state: 'Home'
  card: glance
    title: devices online

but error pops up saying “no card type found.” looks like a need to download a custom plugin for this type of auto entities or something…

Because you manually took control of the GUI.