Formatting of multi-select fields

Hi / Hello

I’m looking for a little bit of help with the structure of my site and have a couple of newbie questions, so if you bear with me I’ll try and explain my needs.

Format of multi-select fields, if I create a multi-select field which has for say has “cats, dogs,mice,flies,etc” how do I format that into a table for the frontend display, instead of a list?

Display an abbreviated Postcode (if this is possible i.e Wiltshire SN5 6HH displayed as Wiltshire SN5)

Can the view list/grid be replaced with a slider or icons instead of a drop down menu, such as https://react.rocks/tag/Slider

Regards

Nigel