One-line: a side panel for secondary context that should not take over the page. 320px wide, square outer corners.

```jsx
<Sheet>
  <SheetTrigger><Button variant="outline"><FilterIcon />Filters</Button></SheetTrigger>
  <SheetPopup side="right"><SheetHeader><SheetTitle>Filters</SheetTitle></SheetHeader><SheetPanel>…</SheetPanel></SheetPopup>
</Sheet>
```
