Gdlv is a graphical frontend to Delve for Linux, Windows and macOS.
Setup
First make sure you have the current version of delve installed:
go get -u github.com/go-delve/delve/cmd/dlv
then install gdlv:
go get -u github.com/aarzilli/gdlv
Use Ctrl+plus and Ctrl+minus, or config zoom 1.5
to change font size.