The size of the symbols used to represent the schematic features contained in schematic diagrams and the size of the labels related to those features can be set feature layer per feature layer through the Symbology and Labels tab on the standard Layer Properties dialog box. But they can also all be increased or decreased with a single click when using the Increase Symbol Sizes 
, Increase Label Sizes 
, Decrease Symbol Sizes 
, and Decrease Label Sizes 
commands available on the Schematic toolbar.
Clicking the and Decrease Symbol Sizes command increases or decreases the symbol sizes for all schematic nodes in the active schematic diagram according to the Ratio parameter specified in the Symbol/Label Sizes section on the General tab of the Schematic Options dialog box.
Clicking the Increase Label Sizes and Decrease Label Sizes commands increases or decreases the size of the labels attached to the schematic features contained in the active schematic diagram according to the Ratio value specified in the Symbol/Label Sizes section on the General tab of the Schematic Options dialog box.
When using the "increase" commands, the sizes of the symbols or labels in the active diagram are multiplied by the value set for the Ratio parameter. That is, when the ratio is 1, the increase commands have no effect. Clicking the same increase command twice while the ratio is 1.2 results in the same symbol or label sizes as would clicking it once while the ratio is 1.44 (that is, 1.2 x 1.2). Conversely, when using the "decrease" commands, the sizes of the symbols or labels in the active diagram are divided by the value set for Ratio.