The CAS Draw user interface was updated to modernize the look and feel, provide additional canvas area, and improve usability on smaller screens.
The main menu bar maintains the same functionality with updated iconography and the addition of access to the keyboard shortcuts legend via the question mark button.
The tool bar and quick node/bond access tools were removed from the left side and bottom, respectively, of the main window. By default, these tool bars launch located on the left and right side of the canvas window but can be moved independently.
The zoom controls were moved to the center below the canvas, and users can continue to enter node values by keyboard using the text box on the bottom left.
Additionally, some tools are grouped together and can now be accessed via a menu that is activated when clicking a tool bar button with an expansion indicator. Clicking a tool bar button with an expansion indicator opens a drop-down menu containing the available tool options. The currently selected and active tool is indicated with grey shading. Clicking a different tool in the menu selects the new tool, which becomes the default tool for that button until a different tool is selected.
The lock rings, lock atoms, rotate fragment, and flip fragment tools are combined into a single menu with the lock ring tool selected by default.
The deuterium and tritium atom buttons were combined with the hydrogen button into a single menu with hydrogen selected by default.
The F, Cl, Br, and I halogen atom buttons were combined into a single menu with Cl selected by default.
Double, triple, and any bonds were combined into a single menu with double bond selected by default.
Lastly, single and double stereochemical bonds were combined into a single menu with beta single bond selected by default.
