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Put \onecolumn when you want one column and \twocolumn when you want two columns
% onetwocolprob2.tex SE 555696
\documentclass[10pt]{book}
\usepackage{lipsum} %%% added
\usepackage[paperheight=9in,paperwidth=7in, top=1in, bottom=0.8in, twocolumn, twoside]{geometry}
\setlength{\columnseprule}{0.4pt}
\usepackage{amssymb}
\usepackage{mathrsfs}
\usepackage[...
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In the following example, I have used width=\columnwidth to make sure the graph is as wide as one column in a twocolumn document. Additionally, I have use siunitx in order to avoid repetitive code in the table:
\documentclass[twocolumn]{article}
\usepackage{tabularx}
\usepackage{tikz, pgfplots}
\usepackage{showframe}
\usepackage{lipsum}
\usepackage{siunitx}
...
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Here is my slightly different suggestion, also based on tabularx.
Additionally to using tabularx and an X type column for the first column in order to ensure the table fits into the available text width, I have used wc{...} type columns for the month columns. This makes them equally wide. I have also moved the color definitions to the preamble and made sure ...
1
Some comments and suggestions:
Use a tabularx environment instead of a tabular environment, and use (a modified form of) the X column type for the first column.
Get rid of all ~ ("tie") spacers; that way, the 11 data columns take up a lot less space, meaning that there's more space available for the first column.
No useful purpose appears to be ...
1
You can control the spacing between columns in a \pseudocode or \procedure command via the colspace option. Setting it to a negative space collapses the columns which, in particular for protocols, allows for more compact presentation. The following example is with colspace=-1cm.
\documentclass[10pt,journal,compsoc]{IEEEtran}
\usepackage{float}
\usepackage{...
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