If I understand correctly, the way to do that would be to go to View --> View Options... or hit Ctrl+J/Cmd+J to bring up the Develop View Options dialogue box. There you can select which elements you'd like to see. Title is one of the options you can select. Then you can choose None for the others. Back on the photo, you can tap the I key to toggle the info on and off as you wish to view it.
As it stands, there are two Loupe Info display setups we can cycle through, each of which allows for three lines of information to be displayed. There are some preset combinations like File Name and Copy Name or Common Attributes but none of those options allow for a customized string of details, like showing the Title and Caption together, for example.
I'd like to see the ability to have more than two setups and the ability to piece together a more elaborate combination of elements to be shown for each line. As it stands, I often want to see more info as I'm in the Develop Module and I have to move into the Library Module and scroll up and down in the side Panel to see the info I'm looking for. It'd be much quicker if the info I use frequently was already visible to get what I need and move along, or to tap the I key a couple times to display it and then hide it again.