First of all, hover over the applet you want to resize. The widget handle will appear. The applet handle takes care of resize, rotate and move.
If they are in the panel, remove them by opening up the panel settings (right side of the panel) and then hovering over them. Click the X in the tooltip. Otherwise, hold click until a menu appears. Click the X in that menu. If you use thedialog, you can click on the icon in the upper right part of the widget icon to remove it.
Right click on the menu, select "Alternatives" and choose one. Currently Plasma comes with 3 application menus; one is a full-screen launcher for touchscreen devices and netbooks; one is the Application Launcher, a signature of Plasma; and then there is the Application Menu, a Windows ME/2000 and earlier style launcher.
|You must unlock widgets (Ctrl + L) before you can remove any activities.|
Open, then check the box . Click on and you are done.
When adding widgets normally, drag them to your chosen section of the panel.
Open the Panel Settings menu. Then you can drag around widgets on and off the panel.
To change length, open up Panel Settings. The arrows pointing right can be dragged to change the maximum panel size; arrows pointing left change minimum panel size. The arrow pointing up is in the center of the panel. To change height, click and hold on the "Height" button in Panel Settings, then drag it to change the height.
Panel Settings -> More Settings -> Auto Hide.
Open Panel Settings. Then, right click on an empty area of the panel. Click "Remove Panel."
Simply select a widget's settings (the wrench icon on the applet handle) and then click on. You will then be able to define a keyboard shortcut for your applet. Notice that unless the widget has defined some use for the keyboard shortcut, the shortcut itself will only give focus to the widget itself.