<p>My G29 command reports</p>

<pre><code>+0.178 +0.281 +0.830
-0.614 -0.012 +0.371
-1.208 -0.849 -0.351
</code></pre>

<p>So should I tighten up the screw of the bed, close to 0,0 position or loosen it?</p>

<p>I have a feeling that when I loosen it, it gets away from zero and I expect the opposite to happen.</p>

<p>For bed leveling i use a capacitive probe and after playing around with the screws here is the result</p>

<pre><code>+0.406 +0.127 +0.411
-0.161 -0.007 -0.041
-0.572 -0.652 -0.668
</code></pre>

<p>Finally the leveling process was found <a href="https://www.youtube.com/watch?v=y_1Kg45APko" rel="nofollow noreferrer">here</a>
But the question remains. The value <code>-0.572</code> corresponds close to <code>0,0</code> ?</p>

After you use the Slice Now button (and the slicing progress bar shows completed), select the preview tab. To the right of the window you will see a pair of vertical sliders. Each slider changes the start and finish locations for the filament layers.
You can slide the left one to the bottom, which will "empty" the virtual print bed. Each movement upward will display a succeeding layer, showing the placement of the filament. This ostensibly will present to you alignment information as well as unexpected holes or other failure points.
I don't know of any slicer that lacks a preview. That doesn't mean one does not exist, but why would such a useful feature be omitted?