Aligning enumerate environments

Question

I have two enumerate environments. In the MWE, the numbers in the second environment are seemingly right-aligned with the numbers in the first, I would like to left-align the numbers in the second environment with those in the first.
The third environment should also be left-aligned with the first two environments. The fourth environment should continue to display as expected.
MWE
documentclass{book}
usepackage[inline,shortlabels]{enumitem}
setlist[enumerate]{leftmargin=4em, align=left}
begin{document}
begin{enumerate}
    item Item 1
    item Item 2
    item Item 3
end{enumerate}
begin{enumerate}[label=1.arabic*.]
        item Item 1.1
        item 1.2
    end{enumerate}
begin{itemize}
    item Item 10
    item Item 20
end{itemize}
begin{enumerate*}[label=(roman*)]
    item Item 100
    item item 200
end{enumerate*}
end{document}

Zarko · Accepted Answer

See if adding
setlist[enumerate]{leftmargin=4em, align=left}

in your document preamble solve your problem.

Complete MWE:
documentclass{book}
usepackage{enumitem}
setlist[enumerate]{leftmargin=4em, align=left}

usepackage{lipsum}

begin{document}
lipsum[11]
begin{enumerate}
    item Item 1
    item Item 2
    item Item 3
end{enumerate}
begin{enumerate}[label=1.arabic*.]
        item Item 1.1
        item Item 1.2
    end{enumerate}
end{document}

Addendum:
After your editing of question situation is changed a lot. Note: enumitem doesn't allow separate settings for in-line lists (as far as I know), however in such situation it advise to define new list with desired features. For example, as:
newlist{inlinelist}{enumerate*}{1}
setlist*[inlinelist,1]{label=(roman*), 
                        before=unskip{: }, itemjoin={{, }}, itemjoin*={{, and }}}

Considering this in the first version of answer, you can write your document example as follows:
documentclass{book}
usepackage[shortlabels]{enumitem}
setlist[enumerate]{leftmargin=4em, align=left}
newlist{inlinelist}{enumerate*}{1}
setlist*[inlinelist,1]{label=(roman*),
                        before=unskip{: }, itemjoin={{, }}, itemjoin*={{, and }}}
usepackage{lipsum}

begin{document}
lipsum[11]

begin{enumerate}
    item Item 1
    item Item 2
    item Item 3: 
end{enumerate}
begin{enumerate}[label=1.arabic*.]
        item Item 1.1
        item Item 1.2
    end{enumerate}

noindent%   
Some text 
begin{inlinelist}[label=(roman*)]
    item Item 100
    item item 200
    item item 300
end{inlinelist}.
end{document}

which yields to:

js bibra · Answer

documentclass{book}
usepackage{enumitem}
begin{document}
begin{enumerate}[
                leftmargin=parindent,
                align=left,
                labelwidth=parindent,
                labelsep=10pt]
    item Item 1
    item Item 2
    item Item 3
end{enumerate}
begin{enumerate}[
                label=1.arabic*.,
                leftmargin=parindent,
                align=left,
                labelwidth=parindent,
                labelsep=10pt]
        item Item 1.1
        item Item 1.2
    end{enumerate}
end{document}

Aligning enumerate environments

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