I think you might have added some css in this grid or else custom stylings to mendix default datagrid class. By default in datagrid, search and control bar buttons will display accordingly, means start from left. So cross verify the custom stylings for data grid.
The only thing i changed in the css is that :
I tried a lot of thing like “align-content: left;” or “align-self: left” etc… and nothing work :/