By default there is no option that can allow us to display 2 or more web parts side-by-side.
To fix this we can use a table.
How to do it ?
enter in Edit Mode;
choose a location for the table;
insert a table with n columns and n rows (depends on the number of web parts);
If you already have some web parts in the page just drag & drop them in the table.
If not, click in a column and then insert the desired web part.
After doing all the steps Save & Close to see the result.