Heidi column/size question

Viewing the database window while selecting the database under localhost some of my rows and sizes have a green highlight on them. I assume Heidi is telling me something but what? Also, if I select a table under my database and view it in the options window some of the datatypes are green, again I assume Heidi is telling me something.

I should mention the database in question was converted to MySQL from MS Access. I didn't create the MS Access database so I don't know what the field types were designed to be.

Again thank you in advance, and I am sorry if I am wasting your time but I need a starting point no matter how stupid some of my questions may sound. I appreciate all the help I can get until I can understand the logic of MySQL and understand what I need to do to make it read and write the data to it correctly.

The tick marker on the database is telling you that this is the currently selected database.

The data types can have a color in HeidiSQL, while green is the default one for text types. See Tools > Preferences > Data.