Reproject with shifted central meridian - dateline gap in ArcGIS

Question

I have reprojected a file of global ocean zoning to Winkel III shifting the central meridian to -180 to center it on the Pacific using ArcGIS 10.5. Doing so, a gap at the dateline appears:

In a closeup, it's actually a line and a gap:

The whole file remains one polygon though. I've tried the Integrate tool but no success. I wonder which tool to use instead, if I am making a mistake regarding the reprojection or if there is any cosmetic fix to make the line disappear (but keep other outlines) in maps?

Answer 1

Normally I use this for a similar looking display issue East-West across the map, but you could try moving the wrap parameter the .prj file. (e.g. +lon_wrap=-180) See wrap parameter explanation here.

Edit:

I do this by creating a custom projection. Then you should be able to customize/write your own .prj file. See the documentation links for Arc and QGIS below.

Arc link // QGIS Link