You have do repository-search as 'none' to disable repository wide search option. You have to do this changes in your share-config.xml file. Alternatively you can do changes in your share-config-custom.xml so it will be easier for future upgrade and changes.
<config evaluator="string-compare" condition="Search">
<search>
<!– default minimum length for search terms –>
<min-search-term-length>1</min-search-term-length>
<!– default maximum number of results for a search –>
<max-search-results>250</max-search-results>
<!– default maximum number of results for user search –>
<max-users-search-results>20</max-users-search-results>
<!– Repository search configuration option –>
<!–
The 'repository-search' config element value can be one of:
none - disable repository wide search option
context - search depending on current context, including repository, all sites, current site (default)
always - always search full repository no matter what the context, disables search context options
always-options - always search full repository no matter what the context, still shows the search context options
–>
<repository-search>always-options</repository-search>
<!–
default option to display filter pane. Override if solr1 is used.
–>
<display-facets>true</display-facets>
</search>
<!– sorting fields and labels –>
<!–
The 'sort' config element contains the name of the content model field
to sort against and can be of the form:
. Short QName string e.g. "cm:name"
. Pseudo cm:content field starting with a "." e.g. ".size"
. Any other valid sortable fts-alfresco special field e.g. "TYPE"
The field can be optionally followed by |true or |false to indicate sort direction,
where true = ascending, false = descending
The element supports the following optional attributes:
label = label text to display
labelId = I18N message id of label text to display
isSortable = true or false for if the field contains sortable data
–>
<sorting>
<sort labelId="search.sort.relevance" isSortable="false"/>
<sort labelId="label.name" isSortable="true">cm:name</sort>
<sort labelId="label.title" isSortable="true">cm:title</sort>
<sort labelId="label.description" isSortable="false">cm:description</sort>
<sort labelId="label.author" isSortable="false">cm:author</sort>
<sort labelId="label.modifier" isSortable="true">cm:modifier</sort>
<sort labelId="label.modified" isSortable="true">cm:modified|false</sort>
<sort labelId="label.creator" isSortable="true">cm:creator</sort>
<sort labelId="label.created" isSortable="true">cm:created|false</sort>
<sort labelId="search.sort.size" isSortable="true">.size|true</sort>
<sort labelId="search.sort.mimetype" isSortable="true">.mimetype</sort>
<sort labelId="search.sort.type" isSortable="true">TYPE</sort>
</sorting>
</config>
Let me know if this solve your problem.
