add custom profile setting doc

release-notes/images/1_90/profile-new-window.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c32bb5ba7f239015156c69e614accb5c89bd9612af8ab805e49dc99e3a011d40
+size 41573

release-notes/v1_90.md

@@ -61,6 +61,12 @@ In the following image you can see a side-by-side comparison, where on the left
 
 _Theme: [Light Pink](https://marketplace.visualstudio.com/items?itemName=mgwg.light-pink-theme) (preview on [vscode.dev](https://vscode.dev/editor/theme/mgwg.light-pink-theme))_
 
+### Configure custom profile for new window
+
+You can now configure a custom profile for a new window by setting the <code codesetting="window.newWindowProfile">window.newWindowProfile</code> setting. This setting allows you to specify a profile that will be used when opening a new window.
+
+![Configure custom profile for new window](images/1_90/profile-new-window.png)
+
 ## Editor