SharePoint List. Gallery Formating

Good morning everyone.

I'm trying to use a list to host a series of hyperlink.

My list has 3 columns:

1) Title (The default one)

2) Topic (Hyperlink column)

3) Language (Radio button choice)

I want to use this list as menu. Similar to the quick link Object in SharePoint (modern).

I made all columns but "topic" invisible

I created a Gallery view and ensure the column header doesn't appear in all items

Now, I have no clue on how to format each tiles.

If I make the font size bigger, the bottom of the text is cropped.

If I make the size of the box bigger on list, I see the result but it's not reflected on what I see on Sharepoint 

So, my questions.

1) How to make my boxes larger (in both list and SharePoint)

2) How can I ensure the bottom of my text (The alternative text for the URL) is not cropped (usually the "p, q, g" )

3) If my text it a bit too long, how can I allow it to take two lines one not only one)

4) How do I remove this little radio button in each tiles ?

5) How do I change the background color of the list object on SharePoint, the background and the background of the tiles ?