#MATL, 7 bytes

32HY(1e

Try it Online!

Explanation

 % Implicitly grab input as a string
32 % Number literal (ASCII for ' ')
H % Clipboard H contains 2 by default
Y( % Fill the second "row" with spaces
1e % Force everything onto one row. Due to MATLAB being row-major, this inserts the spaces
 % Implicitly display the result

MATL, 7 bytes

32HY(1e

Try it Online!

Explanation

 % Implicitly grab input as a string
32 % Number literal (ASCII for ' ')
H % Clipboard H contains 2 by default
Y( % Fill the second "row" with spaces
1e % Force everything onto one row. Due to MATLAB being row-major, this inserts the spaces
 % Implicitly display the result

#MATL, 7 bytes

32JY(1e

Try it Online!

Explanation

 % Implicitly grab input as a string
32 % Number literal (ASCII for ' ')
J % Clipboard J contains 2 by default
Y( % Fill the second "row" with spaces
1e % Force everything onto one row. Due to MATLAB being row-major, this inserts the spaces
 % Implicitly display the result

#MATL, 7 bytes

32HY(1e

Try it Online!

Explanation

 % Implicitly grab input as a string
32 % Number literal (ASCII for ' ')
H % Clipboard H contains 2 by default
Y( % Fill the second "row" with spaces
1e % Force everything onto one row. Due to MATLAB being row-major, this inserts the spaces
 % Implicitly display the result