First of all, apologises for the noob question. Second, I am aware similar questions have been asked but their solutions don't work for me unfortunately. Hopefully someone here can point me in the right direction.

I have a table (markup below), which is rendered very tightly together, which is proving cramped and difficult to read on the document. How can I increase the column width explicitly?

{\bf } & {\bf Classifier 1} & {\bf Classifier 2} & {\bf Classifier 3} \\ \midrule
{\bf F1-Score} & \multicolumn{1}{c}{71.75\%} & \multicolumn{1}{c}{74.30\%} & \multicolumn{1}{c}{77.86\%} \\ \bottomrule

the first line will space out the lines

the second line will space out the columns

\def\arraystretch{1.5} \setlength\tabcolsep{30px}

before your \begin{table}

(It works with \hline, I don't know from which package top/bottom/middle rule come from, hence my not testing it)

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