Android Studio XML layout design preview not available
<p>I don't know what happened, but today when I opened Android Studio the "split-screen" of the editing layout (Preview -half screen XML and the other half was the device preview-) was missing.</p>

<p><a href="https://i.stack.imgur.com/WLDVa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WLDVa.png" alt="enter image description here"></a>
- No preview option</p>

<p><a href="https://i.stack.imgur.com/TXN2W.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TXN2W.png" alt="enter image description here"></a>
- The "component tree" tab was added automatically, yesterday I did not have this</p>