You can change the horizontal start/end position of each system individually; for example, if you want to indent a single system or increase the gap before an individual coda section.
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If you want to increase the space before staff labels, you can change the minimum indent for systems with staff labels.
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If you want to change the end position of systems because they do not fill the entire width of the page, you can change the minimum fullness for horizontal justification.
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If you want to change the width of all systems on a page by the same amount, you can change the width of the music frame.
Prerequisite
Note Spacing
is selected in the Engrave toolbox.
Procedure
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In Engrave mode, select the system handle at the start/end of each system whose start/end position you want to change.
System handle at the start of a system 
System handle at the end of a system
Result
The start/end position of the selected systems is changed. Notes on the selected systems appear more/less tightly spaced, depending on whether moving the system handles made their system narrower or wider.
Dorico Pro automatically inserts system breaks at the start of the moved and subsequent systems.