diff --git a/changelogs/fragments/8331.yml b/changelogs/fragments/8331.yml
new file mode 100644
index 000000000000..127f61d5eb3c
--- /dev/null
+++ b/changelogs/fragments/8331.yml
@@ -0,0 +1,2 @@
+fix:
+- Discover query input background not shrink when window resize ([#8331](/~https://github.com/opensearch-project/OpenSearch-Dashboards/pull/8331))
\ No newline at end of file
diff --git a/src/plugins/data/public/ui/query_editor/_query_editor.scss b/src/plugins/data/public/ui/query_editor/_query_editor.scss
index 79a453d7b21d..a970a970853b 100644
--- a/src/plugins/data/public/ui/query_editor/_query_editor.scss
+++ b/src/plugins/data/public/ui/query_editor/_query_editor.scss
@@ -189,6 +189,7 @@
   padding: calc($euiSizeXS + 1px);
   background-color: $euiColorEmptyShade;
   overflow: initial !important; // needed for suggestion window, otherwise will be hidden in child
+  min-width: 0;
 
   .monaco-editor .view-overlays .current-line {
     border: none;