@fsoupimenta
The tool is well implemented. But there are some observations:

1. When trying to export an invalid graph the software freezes, for example the SomeGraphs.g6 file.
2. There should be a check to prevent (#rows) X (#columns) from being less than the number of graphs.
3. I also observed unexpected behavior when exporting a list of graphs with a single graph.

On closer inspection, I noticed that the correct thing to do is for the user to choose only the number of columns, or rather the number of graphs in each row. This way, the plotting is done in a row, which must be broken whenever it reaches the number chosen by the user. This solves problems (2) and (3) together. See the second topic of the PR description.

Finally, I think that in the tree menu, we can rename the exports to: Single file - image (.pdf) AND Multiple files - image (.pdf).

@fsoupimenta The tool is well implemented. But there are some observations:

1. When trying to export an invalid graph the software freezes, for example the SomeGraphs.g6 file.
2. There should be a check to prevent (#rows) X (#columns) from being less than the number of graphs.
3. I also observed unexpected behavior when exporting a list of graphs with a single graph.

1. The problem of exporting files containing invalid graphs has been resolved.

2. The limitation of rows and columns has been implemented, where the value must be greater than 0. If the user enters a character that is not a number or a value less than or equal to 0, a following warning screen will be displayed:

   

3. The aesthetics of the export have been improved so that the graphs are similar to those displayed in the software. In addition, a logic has been implemented where the size of the plot is proportional to the number of rows and columns, in order to improve the visualization of the graphs in some cases. Below are examples:

2x2	5x5	7x7