Hello,
You can set 24-hours in Prices tab. There is option Time range. If you set it from 0:00 to 0:00, it will be the whole day.
If you want to change calendar functionality, you have to modify views in:
{project_root}/components/com_booking/views/subject/tmpl/{default_files}
Maybe there are also some functions calling helpers to render some parts of design.
We can offer you to make these changes as paid custom support. If you are interesting in, let us know on
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with more information about your request.