Add UI Controls page

numeric-field.md

@@ -8,5 +8,6 @@ Numeric fields on Aseprite can evaluate simple math expressions:
 
 **SEE ALSO**
 
+[UI Controls](ui-controls.md) |
 [New Sprite](new-sprite.md) |
 [Issue #1762](https://github.com/aseprite/aseprite/issues/1762)

ui-controls.md

@@ -0,0 +1,29 @@
+# UI Controls
+
+Here we show some general information about controls/fields you will
+find on the Aseprite User Interface (UI).
+
+* [Sprite Editor](sprite-editor.md)
+* [Timeline](timeline.md)
+* [Workspace](workspace.md)
+* [Color Bar](color-bar.md)
+
+## Math in Number Fields
+
+[Numeric fields](numeric-field.md) on Aseprite can evaluate simple math expressions:
+
+![Math demo in number fields](numeric-field/math.gif)
+
+## Drag and Drop Workspace Tabs
+
+You can drag-and-drop tabs [in the workspace](workspace.md), duplicate
+them using the <kbd>Ctrl</kbd> or <kbd>Alt</kbd> keys along with the
+<kbd>Left Mouse Button</kbd>:
+
+![Drag and drop tabs demo](workspace/drag-and-drop-tabs.gif)
+
+---
+
+**SEE ALSO**
+
+[Workspace](workspace.md)