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Locking is pretty much standard procedure in a lot of programs. When an element or an entire document is done, or at least done for the time being, you can designate it Locked and then it won't be editable until you Unlock it. It's very useful in a lot of programs and it will be no surprise that OmniGraffle is able to lock things. We have got our Org Chart here and everything is done, but everything is still totally editable. If I select any object and then go up to the Toolbar where there is the Lock/Unlock button, I can click it once to be locked and you'll notice that its outline goes gray instead of blue and it also has those Xs and sure enough, if I try to drag it, it will not drag.
It is locked in place. Now if I did want to edit it, I could just select it and Unlock it, same button, to toggle. Now it's unlocked and again, it can be moved. Oftentimes I will want to Lock a whole document when I am done, and the convenient and common shortcut is Command+A to Select All, and then I can lock everything. Now even though these were all Locked together, if I need to edit one, like I notice this is a little low now, I can just Unlock a single element, move it, and then Lock it back up again.
The whole purpose of a Lock is to feel secure and it should make us feel secure that OmniGraffle has a simple locking mechanism that works really well. Locking is useful for several reasons. Sometimes you will use it when things were just close together on the canvas and you're having trouble selecting the right part, you can lock the parts that you don't want to edit for the moment. Also, as your document gets close to conclusion and you have got a lot of time invested in it, you are going to want to Lock it, just so you don't make inadvertent changes.
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