Windows in synfig,

I closed some windows whilst working with synfig and now thry’re gone even when I reopen a new file Anyone know how to get them back ?

I can not fully understand what it is your problem. but if you are meaning some panel windows are gone,
You can call them back just by using the menu:

Toolbox:  File -> Panels -> Reset Windows to Original Layout

Hope it help. Enjoy Synfiging