diff --git a/lib/history.zsh b/lib/history.zsh
index 876936b87..a37270a07 100644
--- a/lib/history.zsh
+++ b/lib/history.zsh
@@ -10,4 +10,4 @@ setopt hist_ignore_dups # ignore duplication command history list
 setopt hist_ignore_space
 setopt hist_verify
 setopt inc_append_history
-setopt share_history # share command history data
+# setopt share_history # share command history data
diff --git a/plugins/history-substring-search/history-substring-search.zsh b/plugins/history-substring-search/history-substring-search.zsh
index 53f707c79..ef3a73539 100644
--- a/plugins/history-substring-search/history-substring-search.zsh
+++ b/plugins/history-substring-search/history-substring-search.zsh
@@ -132,8 +132,8 @@
 # configuration variables
 #-----------------------------------------------------------------------------
 
-HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_FOUND='bg=magenta,fg=white,bold'
-HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_NOT_FOUND='bg=red,fg=white,bold'
+HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_FOUND='bg=cyan,fg=black'
+HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_NOT_FOUND='bg=magenta,fg=black'
 HISTORY_SUBSTRING_SEARCH_GLOBBING_FLAGS='i'
 
 #-----------------------------------------------------------------------------