Redmine

It is not broken but an expected behavior. Redmine 3.4.0 and later display projects in multiple columns (r15910).

If you prefer to see projects in single-column style, modify public/stylesheets/application.css (remove 10 lines):

Index: public/stylesheets/application.css
===================================================================
--- public/stylesheets/application.css    (revision 17180)
+++ public/stylesheets/application.css    (working copy)
@@ -565,16 +565,6 @@
 ul.projects.root {margin:0; padding:0;}
 ul.projects li {list-style-type:none;}

-#projects-index {
-  column-count: auto;
-  column-width: 400px;
-  -webkit-column-count: auto;
-  -webkit-column-width: 400px;
-  -webkit-column-gap : 0.5rem;
-  -moz-column-count: auto;
-  -moz-column-width: 400px;
-  -moz-column-gap : 0.5rem;
-}
 #projects-index ul.projects li.root>ul.projects { border-left: 3px solid #e0e0e0; padding-left:1em;}
 #projects-index ul.projects li.root {margin-bottom: 1em;}
 #projects-index ul.projects li.child {margin-top: 1em;}