The left sidebar is an area in the thinkorswim interface where you keep gadgets necessary for your work. These gadgets allow you to view some trading information immediately, watch news or even distract yourself by playing a couple of built-in games without needing to leave the main window of the platform. The content of the left sidebar is completely customizable. It is up to you to decide which gadgets to keep there; refer to pages in this section, to learn more about each of them.
To add a gadget, click the 'plus' button at the bottom of the sidebar. The Select gadget dialog will appear. Click on the name of the gadget you would like to display; it will be immediately added. Note that you can have up to 15 gadgets at a time on the left sidebar, however only a subset of these will be onscreen at any given time depending on their heights. The sidebar can be scrolled using the arrow buttons at the bottom. You can also resize the sidebar by dragging its right border to the width you like.
If you don't need a previously added gadget anymore, you can remove it from the left sidebar. In order to do that, click the Show actions button in its top right corner and choose Delete gadget from the menu; the gadget will be removed. If you've added many gadgets and like to quickly delete several of them, consider using the Customize gadgets dialog (accessible via the 'gear' button at the bottom). This dialog displays a compact list of currently added gadgets; clicking the 'x' button next to a gadget name will delete the gadget from the sidebar. This menu also allows you to rearrange the order of your gadgets by clicking and dragging their names into a new order.
The Show actions menu (accessible from the button at the top-right corner of each gadget) also allows you to detach or switch the gadget. Detaching means displaying the gadget in a separate window with an option to keep it above all other windows (for this purpose, click the 'pin' button on top of the detached gadget). Switching means replacing a gadget with another: after clicking Switch gadget, you will see the Select gadget dialog where you can choose a gadget to replace the current one.
If you don't need any of the gadgets at the moment, you can hide the whole sidebar. In order to do that, click the Hide gadgets button in the bottom left corner of the sidebar; the sidebar will be hidden. The button itself, however, will be kept where it belongs so that you can quickly unhide the sidebar once you need it again.