How Do I Do That In Lightroom Classic?, 2nd Edition

Make My Panels Larger?

Just move your cursor right along the edge (the edge closest to your image[s], not the outside edge), as shown above, and your cursor will change into a two-headed arrow (shown circled here in red). Now, just click-and-drag to make your panels larger or smaller (your panels will only get so thin—they need a certain amount of space for the sliders and such to work—but they can get really wide if you want them to, just keep dragging in toward your image[s]).