There is no direct search and replace function. However, if it is RGB colors, you can use the search function in the layer list to display all vector layers with a specific fill or line color.
Example:
Type a command in search field to display all vector layers that use #ffff00 yellow fill color:
Code: Select all
&fillcolor="RGB#ffff00"
Code: Select all
&linecolor="RGB#ffff00"
PS: It is best, however, to create a document color ("View> Lists> Document Color List") for the same colors. Then you can change the color in the document color list, and all layers that use that color will be changed automatically.