No issue: test one shard per UI test on FTL

tools/taskcluster/flank.yml

@@ -51,7 +51,14 @@ flank:
 
   # test shards - the amount of groups to split the test suite into
   # set to -1 to use one shard per test.
-  max-test-shards: 4
+  max-test-shards: -1
+  ### Output Style flag
+  ## Output style of execution status. May be one of [verbose, multi, single, compact].
+  ## For runs with only one test execution the default value is 'verbose', in other cases
+  ## 'multi' is used as the default. The output style 'multi' is not displayed correctly on consoles
+  ## which don't support ansi codes, to avoid corrupted output use single or verbose.
+  ## The output style `compact` is used to produce less detailed output, it prints just Args, test and matrix count, weblinks, cost, and result reports.
+  output-style: compact
   # repeat tests - the amount of times to run the tests.
   # 1 runs the tests once. 10 runs all the tests 10x
   num-test-runs: 1