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If I run code

Graphics3D[Cuboid[], ViewPoint -> 1, 1, 1]

the output is

After rotating (by mouse click and drag) the output in some direction, and run the same code again

Graphics3D[Cuboid[], ViewPoint -> 1, 1, 1]

then the output becomes

Again, rotate the output in some direction, and run the same code

Graphics3D[Cuboid[], ViewPoint -> 1, 1, 1]

then the output becomes

I knew that with ViewPoint option, Mathematica tries to fix 'a kind of view property'. The code stated above, will not generate graphics like

But also I knew that it is not enough to fix the view completely, with ViewPoint option only.

How can I completely fix the view ? For example, How can I generate

from a certain code, with 100% assurance, regardless of the state (what I've done so far since starting mathematica program) of Mathematica ?

Set an explicit value for ViewPoint and for ViewVertical.

Add the option PreserveImageOptions -> True if you want to preserve other options (such as ImageSize) set interactively, PreserveImageOptions -> False if you want them to revert to the original values after interactive changes:

Graphics3D[Cuboid[], 
 ViewPoint -> 1, 1, 1, 
 ViewVertical -> 0.5, 0, 1,
 PreserveImageOptions -> True]

Graphics3D[Cuboid[], 
 ViewPoint -> 1, 1, 1, 
 ViewVertical -> 0.5, 0, 1,
 PreserveImageOptions -> False]

We can find the appropriate options from this input:

Graphics3D[Cuboid[], ViewPoint -> 1, 1, 1] // AbsoluteOptions

(*AlignmentPoint -> Center, AspectRatio -> Automatic, 
AutomaticImageSize -> False, Axes -> False, AxesEdge -> Automatic, 
AxesLabel -> None, AxesOrigin -> Automatic, AxesStyle -> , 
Background -> None, BaselinePosition -> Automatic, BaseStyle -> , 
Boxed -> True, BoxRatios -> 1., 1., 1., BoxStyle -> , 
ClipPlanes -> None, ClipPlanesStyle -> Automatic, 
ColorOutput -> Automatic, ContentSelectable -> Automatic, 
ControllerLinking -> Automatic, ControllerMethod -> Automatic, 
ControllerPath -> Automatic, CoordinatesToolOptions -> Automatic, 
DisplayFunction -> Identity, Epilog -> , FaceGrids -> None, 
FaceGridsStyle -> , FormatType -> TraditionalForm, 
ImageMargins -> 0., ImagePadding -> All, ImageSize -> Automatic, 
ImageSizeRaw -> Automatic, LabelStyle -> , Lighting -> Automatic, 
Method -> Automatic, PlotLabel -> None, 
PlotRange -> 0., 1., 0., 1., 0., 1., 
PlotRangePadding -> Automatic, PlotRegion -> Automatic, 
PreserveImageOptions -> Automatic, Prolog -> , 
RotationAction -> "Fit", SphericalRegion -> False, 
Ticks -> Automatic, TicksStyle -> , TouchscreenAutoZoom -> False, 
ViewAngle -> Automatic, ViewCenter -> 0.5, 0.5, 0.5, 
ViewMatrix -> Automatic, ViewPoint -> 1., 1., 1., 
ViewProjection -> Automatic, ViewRange -> All, 
ViewVector -> Automatic, ViewVertical -> 0., 0., 1.*) 

Then, the desired & appropriate parameters may be set:

Graphics3D[Cuboid[], ViewPoint -> 1, 1, 1, 
ViewCenter -> 0.5`, 0.5`, 0.5`, ViewVertical -> 0.`, 0.`, 1.`]

Use AbsoluteOptions to determine the definitive options for the current viewpoint you have outputted. From here, copy and paste these into your desired definition. What I mean by this is that you take your Cuboid output, defined with the noted Viewpoint, and then type //AbsoluteOptions after the output. Evaluate this and use the output to be applied to your definition.

I have no experience with the answer of user @kglr, however, I can say with absolute certainty and confidence that if you find a viewpoint you like, perform the above procedure and you will have the desired output every time you evaluate it, just as you need/ask for here.

Hope this helps!