Contact records in Nimble enable you to keep track of important details about your contacts such as email communication, addresses, phone numbers, notes, and other activities. So you are seeing what's most important to you when you first visit the contact record, you can rearrange the widgets.
To do this, just click the ellipsis icon and choose "Reorder Left Panel Widgets". You can now drag and drop the widgets or even hide them.
When you are ready, click "Close" to save your changes.