There are options to maintain the panels content within the DOM at all times (using an approach like you mentioned with display: none) and options to remove content from the DOM.
In terms of vanilla TS the library is almost entire written in vanilla TS with small wrapper libraries for Vue and React.
In theory wrappers could be written for other frameworks such as Angular (which is something I would like to get done this year)
https://dockview.dev/docs/core/panels/rendering
There are options to maintain the panels content within the DOM at all times (using an approach like you mentioned with display: none) and options to remove content from the DOM.
In terms of vanilla TS the library is almost entire written in vanilla TS with small wrapper libraries for Vue and React.
In theory wrappers could be written for other frameworks such as Angular (which is something I would like to get done this year)
Loading and saving state is supported though
https://dockview.dev/docs/core/state/save
Let me know if that answers the question