(You cannot use the Lasso tool to select non-ink objects (shapes, pictures, etc.).
Drawing in OneNote If you're using OneNote and want to draw, see these other articles: OneNote for Windows 10: OneNote: OneNote Online: Extra features in PowerPoint Select parts of an ink drawing or written words (PowerPoint only) To select part of a drawing or some written words, use the Lasso tool. With your pen or finger, select the word or ink drawing that you want to erase. Under Ink Tools, on the Pens tab, click the arrow below Eraser, and then pick an eraser size. Delete whole written words or ink drawings. You can highlight text in Excel, Word, and Outlook, but PowerPoint doesn't support highlighting text. Point and drag your pen or finger over the text that you want to highlight. Under Ink Tools, on the Pens tab, click Highlighter, and then pick a highlight color. On the touch screen, begin writing or drawing. To change the ink color and stroke width, point to the color and width (0.35mm - 0.5mm) you want. Find the drawing tools Go to the Review tab and select Start Inking to display the Ink Tools and Pens tab. Then you can use the pen to move, resize, or rotate the ink object. Use the supported digital pen button to Lasso Select ink without visiting the ribbon. In both Excel and PowerPoint, with a digital pen, you can select an area without even tapping the selection tool on the ribbon. Then you can manipulate that object as you wish: move it, change its color, and so on. A faded, dashed selection region appears around it, and when you're done, the portion you lassoed is selected. With your pen or finger, drag to draw a circle around the part of the drawing or word that you want to select. Under Draw Tools on the Ribbon, tap Lasso Select. (This tool can't select non-ink objects-that is, shapes, pictures, etc.). Applies only to PowerPoint and Excel: To select part of a drawing or words written in ink, use the Lasso Select tool. It's most useful when you have a mixture of standard and ink objects and you only want to select an ink object. PowerPoint and Excel also have an ink selection tool, Lasso Select, specifically for selecting objects drawn with ink. All apps include a standard selection tool on the Draw tab of the Ribbon that can select both digital ink drawings and any other kinds objects. Some active pens, such as the Surface pen, have an eraser that you can also use to erase digital ink. Dragging across segments is an easy way to erase several at once. With the Segment Eraser in PowerPoint, you can simply tap a segment of ink or drag across it to remove it (rather than having to thoroughly wipe away the entire segment). With your pen or finger, drag the eraser over the ink you want to remove. Tap the down arrow on the Eraser button to pick the eraser that you want.).
(In PowerPoint for Office 365, you can choose from four erasers. Tap again to open the menu of Thickness and Color options for the pen. If the Draw tab is grayed out so that you can't select a pen, go the View tab and select Print Layout. In Word, you must be in Print layout to draw with ink. On the Draw tab of the Ribbon, tap a pen to select it. You define the pens you want to have, and they are then available in Word, Excel, and PowerPoint. Write, draw, or highlight text The new pen set is customizable and portable.
Otherwise, turn it on by selecting File Options Customize Ribbon Draw. If your device is touch-enabled, the Draw tab is turned on automatically.
First with the introduction of Office for iPad in 2014, then the addition of OneNote for Mac and iOS and an updated.