[Lens] Fix styling popover controls (#202865)

## Summary

Fixes styling popover controls alignment. Fixes #202121

<img width="505" alt="Screenshot 2024-12-03 at 5 30 55 PM"
src="https://github.com/user-attachments/assets/a44c2a85-7bac-497c-8354-acab6e48ba38">


### Checklist

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Marta Bondyra <[email protected]>
Co-authored-by: Elastic Machine <[email protected]>

x-pack/plugins/lens/public/visualizations/xy/xy_config_panel/visual_options_popover/missing_values_option.tsx

@@ -88,6 +88,7 @@ export const MissingValuesOptions: React.FC<MissingValuesOptionProps> = ({
           {fittingFunction && fittingFunction !== FittingFunctions.NONE && (
             <>
               <EuiFormRow
+                fullWidth
                 display="columnCompressed"
                 label={i18n.translate('xpack.lens.xyChart.endValuesLabel', {
                   defaultMessage: 'End values',
@@ -117,6 +118,7 @@ export const MissingValuesOptions: React.FC<MissingValuesOptionProps> = ({
                 />
               </EuiFormRow>
               <EuiFormRow
+                fullWidth
                 label={i18n.translate('xpack.lens.xyChart.missingValuesStyle', {
                   defaultMessage: 'Show as dotted line',
                 })}