Toolbar component can be imported from spreadsheet module using the following code. You can compose your own toolbar or even use a third-party component to render the buttons.
Radix icons are used for the toolbar buttons, but this can be easily swapped to any icon set by using custom components.
BottomBar component is a container for the footer of the Spreadsheet, which houses Sheet Tabs, Sheet Switcher, Sheet Status and NewSheetButton component